UNIT#02 ATOMIC STRUCTURE Flashcards
The mass of a proton is;
1.6726 x 10^-31 kg
What will be the effect on protons when passes through the electric field?
Deflection towards cathode
Positive rays are produced;
By the bombardment of cathode rays on gas molecules
Pressure in the gas discharge tube was kept;
0.01 torr
Positive rays give flash on
ZnS
The relationship between the energy of a photon of light and its frequency is given by:
Planck’s Quantum Model
The velocity of the photon;
Is independent of wavelength
Plank’s theory says energy is emitted:
In a discontinuous manner
The planks equation is:
E= hν
(v= wavenumber)
Quantum number which is not derived from the Schrodinger wave equation;
Spin
A nodal plane in an orbital is the plane where the electron density is;
Zero
The number of degenerate orbitals in a sub-shell having a sausage shape are;
5
Quantum number values for 3p orbital are;
n=3, l=1
Maximum number of electrons that can be accommodated in the p-subshell
6
Which sub-shell has the highest energy;
n=5, l=3, m=+1
Magnetic quantum number values for the d-subshell are;
5
A p-orbital has ___ energy than the s-orbital of the same principal quantum number
Higher
A p-orbital has ___ energy than the s-orbital of the same principal quantum number
Higher
Which set of the quantum numbers represents the 29th electron of the Cu atom
Need to understand it
The d-orbital which is bi-lobed with a collar is represented as:
dz2
____ is/are isoelectronic with K+
➡P-3
➡S-2
➡Si-4
The atomic number of an element is 26. How many electrons are present in the M-shell of this element in the ground state;
14
The electronic configuration of an element is 1s2, 2s2, 2px1, 2py1, 2pz1. This represents a/an:
Ground State
The correct electronic configuration of 29Cu is:
xxx
Which one of the following ions has a similar electronic configuration to Ar:
Ti+4
In the electronic configuration of Cu and Cr which of the following is true:
7 electrons in d-orbitals
Which violates Hund’s rule?
Which has the same spin
Which one of the following represents the most stable configuration of three electrons for the ground state of an element in group VA
npx1, npy1, npz1
A specie Z has following electronic configuration 1s2, 2s2, 2p6, 3s2, 3px2, 3py1, 3pz1
What could Z be
S
The total number of lobes in all the orbitals of a d-subshell are;
18
“Two electrons in the same orbital should have opposite spins” according to;
Pauli’s exclusion principle
The e/m value for the canal rays is maximum for:
Hydrogen
(The value of e/m of positive rays is inversely proportional to molar mass)
The maximum number of electrons in a sub-shell is given by;
2(2l + 1)
According to Bohr, the orbits in which electrons revolve around the nucleus are;
Circular
The atomic number of K:
19
A number of protons, electrons and neutrons in Pb+2:
➡82
➡80
➡125
Spin could be:
➡+1/2
➡-1/2
Cancer treatment which radiation use:
Gamma
M-shell contains:
s, p, d
Who discovered neutron:
Chadwick
If electrons are passed in electric and magnetic field then:
Will go straight
Total no. of electrons that can be accommodated in the f-subshell:
14
n + l value for 5d is:
7
A maximum number of electrons in the p-subshell are:
6
Which one has greater mass?
Alpha
Which one has greater mass?
Alpha
A number of electrons in the 3p subshell of Ca?
6
The number of electrons in chloride ion:
18
According to Planck’s quantum theory
➡a body emits energy in quanta
➡a body absorbs energy in quanta
➡emits or absorbs radiations discontinuously
Rydberg’s constant is related to the atomic no. as:
Z2
The magnetic quantum number of s is:
0
Planck’s constant was named after a scientist:
Planck
The probability of finding an electron between s-orbitals is zero. This place is called:
Nodal Plane
Positive rays are also known as:
Canal Rays
Each electron in an atom must have its own unique set of quantum numbers is a statement of:
Pauli exclusion principle
During bond formation, d orbitals split into ____ of orbitals?
2 sets
he e-m values of the positive rays depend on ____ enclosed in a discharge tube
Nature of gas
The lobes of d-orbitals lie between the axis:
First Three
Different atoms of the same elements are called isotopes having different ____ but the same ____ property?
➡Physical
➡Chemical
The maximum probability of finding an electron is at a distance of
0.53nm
Potassium has electronic configuration and becomes an ion by attaining configuration:
2, 8, 8
A total number of electrons that can be accommodated in the f-subshell?
14
A number of electrons in the 3p orbital of Ca?
6
Which has greater energy according to the Auf-bau principle?
7s
Spectrum is the visual display or ___ of component of white light it is passed through a prism
Dispersion
All the three p-orbitals have the same energy in the absence of a magnetic field and are called ____ orbital’s
Degenerated
How do the ‘p’ orbitals have the same energy in the absence of a magnetic field and are called ___ orbital’s
Orientation
Line spectrum of sodium contains ___ coloured lines separated by a definite distance
Two Yellow
Isoelectronic species have the same
Electronic configuration
The equation E = -2.17 x 10^-18 [1/n2] J gives the energy associated with electrons in the nth orbit of the hydrogen atom. Its negative sign shows that the electron is;
Bound by nucleus
The atomic number of potassium
19
Balmer series in H spectrum lies in ___ region
Visible
The azimuthal quantum number is represented by;
l
Which one has more mass?
α- particle
If there are 9 protons, 9 electrons, and 9 neutrons then the atomic mass will be;
18
Which rays are used for the treatment of cancer;
Gamma
Penetration power of orbitals;
s>p>d>f
The azimuthal quantum number depends on:
n
How many maximum no. of electrons are present in an orbital?
2
Which of the following is the correct order of orbital in increasing energy order is:
s
Positively charged particles in the discharge tube were moved;
Cathode
The exact voltage required in gas discharge tube does not depend upon;
Nature of the gas
Consider the following reaction 4 Be + 2He + 6C + 1n.
This reaction is :
➡An exothermic reaction
➡A nuclear reaction
➡An example of artificial radioactivity
Number of electrons, protons and neutrons present in Zn+2 respectively
➡28
➡30
➡36
The nucleus of an atom is made up of 8 protons and 8 neutrons. Which atoms it is;
O
Which rays are more penetrating in nature
γ- rays
A fast moving neutron can eject from nitrogen
α- rays
e/m ratio of cathode rays is ___ than that of canal rays
Greater
The e/m ratio for the positive rays is maximum for;
Hydrogen
Thickness of Gold foil kept:
0.00004 cm
Rutherford bombarded ___ particles in discovery of nucleus
Alpha rays
Which of the following is not unit of wave number;
m-1
An electron makes a transition from energy state E3 to E1 will emit a photon of frequency
ν = (E3 - E1)/h
(v= wavenumber)
Which set of quantum numbers is not possible:
n=3, l=3, s=+1/2
(n>l)
If the value of n=4 what is probable value of l
0,1,2,3
The number of electrons in a shell can be calculated by formula;
2n2
When azimuthal quantum number l=2, then ‘m’ can have value;
5
If the value of n=4 what is probable value of l
0,1,2,3
The atomic number of an element is sixteen. It belongs to period and group number of the periodic table respectively
3,6
When 4 orbital is complete the entering electron goes into;
5d
Which of the following species has more electrons than neutrons;
O-1
Positive rays are produced;
By ionizing the gas
Pressure in gas discharge tube was kept ___ to produce cathode rays
0.01 torr
The nature o cathode rays in discharge tube:
Is independent of the nature of the gas used in discharge tube
Which of the following are not able to ionize the gas:
Neutrons
Which order of mass is correct in ascending order:
e
Which of the following specie has more electrons than neutrons:
O-1
Positive rays give flash on;
ZnS
The wave number of light emitted by a certain source is 2 x 10^6 m-1. The wavelength of this light will be :
500nm
(v= c v ➡Wavenumber)
Which of the following relationship is incorrect;
➡E ∝v❌
➡E ∝v (wavenumber)❌
➡v(wavenumber) = λ ✅
➡E ∝ 1/λ ❌
All of the following were theorized by Bohr in the description of atom except:
Electron continuously radiate energy in the form of radiation in a given orbit
Electronic configuration of species M+2 and its atomic weight is 56, number of neutrons in the nucleus of species M is:
30
Which of the following quantum number is not derived from Schrodinger wave equation:
Spin quantum number
The numebr of orbitals in the 2nd principal quantum number of an atom is;
4
Magnetic quantum number is related to;
Orientation of orbital
Existence of pair of lines in spectrum of sodium is explained by;
Spin quantum number
According to Bohr’s atomic thoery, the angular momentum (mvr) of an electron is equal to;
nh/2π
The last electron in the Na and K can be distinguished by:
Principal quantum number
Which set of quantum number is not possible
n=3, l=3, s= +1/2
The number of unpaired electrons in p-subshell of sulphur atom is;
2
Which quantum number is used to represent the subshells
Azimuthal quantum number
The maximum probability of finding an electron in a hydrogen atom according to Schrodinger is;
0.053 nm
Which of the following statment is correct about azimuthal quantum number. it tells
Shape of orbital
A subshell having n=6 and l=3 is designated as:
6f
Which subshell is nearest to nucleus:
1s
The number of degenerate orbitals in p-subshell is;
3
Which one of the following subshells does not exist;
2d
__- is a region of space in which there is high probability of finding an electron in an atom;
Atmoic orbital
According to quantum mechanics, the size of electronic shell is told by the quantum number:
Principal quantum numeber
How many number of clock wise electrons are present in helium;
1
Which of the following rule/principle helps us to determine order of filing of subshells by electrons:
Auf bau principle
Filling order of 4s, before 3d is explained by:
(n+l) rule
Which of the following orbitals can accomodate 2 electrons:
➡Atmoic orbital
➡Hybrid orbital
➡Molecular orbital
Electronic configuration of an atom is 1s2, 2s2, 2p4. Number of unpaired electrons are:
2
Decreasing energy order of subshell of a particular shell is:
f>d>p>s
Which of the following helps to predict valency of element;
Hunds rule
Which of the following contains unpaired electron;The number of orbitals in M-shell are;
Ni+2
The number of orbitals in M-shell are;
9
How many electrons can fit into the subshell for which n3, l1
6
How many total unpaired electrons are present in an atom with Z=24
6
Without applying Hund’s rule the electronic configuration of one of the following cannot be justified:
Phosphorus
A pair of isoelectroic species is;
➡K+
➡Ar
Which of the following does not correctly relate the arrangement of electrons:
Arrangement of electrons in a shell is given by octet rule
Total number of valence electrons in phosphonium Ph+4 ion is;
8
Total number of valence electrons in phosphonium Ph+4 ion is;
8
The electronic configuration of an element with atomic number 29 is;
xxx
Which of the folowing oxides of nitrogen is isoelectronic with CO2
N2O
Which of the following has minimum number of unpaired d-electrons
CO+2
Number o unpaired electron in p-subshell of ‘F’ is
1
Electronic configuration o K is;
[Ar] 4s1
The mass of a neutron is;
➡1.675 x 10^-27 kg
➡1.675 x 10^-24 g
➡1.0087 amu
The e/m value of He+1 ion in comparison to the e/m value of electron is;
7344 times lesser
What will be the effect on electron when passed through the electric field
Deflection towards anode
X species carry +3 charge and the number of electrons and neutrons are 10 and 14 respectively. What is the atomic mass of X
27
Which of the following set of ions is isoelectronic
Sc+3, Ca+2, S-2
Which of the following particles would on losing an electron have its outermost p-orbital as half filled
P-1 Ion
Isotopes differ in;
Properties with respect to their mass number
Which property is the same for two nuclides Ar and K
Number of nucleons
The correct set of four quantum numbers for the valence electron of potassium is;
➡n=4
➡l=0
➡m=0
➡s=+1/2
Identify the correct order of decreasing energy
3s>2s>1s
A correct number of degenerate orbitals
➡p=3
➡d=5
➡f=7
The maximum number of electrons in a subshell can be calculated by using the formula:
2(2l+1)
The incorrect statement about d-orbitals:
➡It is not present in the first two principle energy levels❌
➡They are associated with only transition elements✅
➡They are five degenerate orbitals in d-subshell❌
➡d-Orbitals can be filled before p-orbitals in the same principle energy level❌
Valence electron fo K has ___ value for spin quantum number with _____ spin.
+1/2, Anti-clockwise
The second shell can accommodate 8 electrons how many electrons can be placed in the 4th shell
32
The correct set of quantum numbers is;
➡n=2
➡l=1
➡m=0
➡s=+1/2
The place between two orbitals where the probability of finding the electron is zero is known as:
Nodal Plane
The shapes of s orbitals are circular and their size:
Increases with the increase in principal quantum number
The electronic configuration of P is:
xxxxxxxxxxxxxxxxxxx
The number of d-electrons in Fe+2 (Z=26) is not equal to;
p electrons in Ar (Z=18)
The rule for filling electrons in subshells o atoms is;
Aufbau’s Principle
When the 6d orbital is completed the entering electron goes into;
7p
A number of orbitals required to place all electrons of an element with atomic number 30:
15
Which of the following has 5 unpaired electrons in d sub-shell
➡Mn+2
➡Fe+3
➡Cr+1
The mass of a neutron may be equal to;
Mass of proton + Electron + Neutrino
The difference in radii and energy between the first two orbits is:
➡Minimum
➡Maximum
In the hydrogen atom, when an electron jumps from any high-energy orbit to the second orbit, the radiation emitted will fall into the:
Visible Region
Slow neutrons are more effective than fast neutrons for purpose of:
Fission
Which one has the shortest wavelength when moving with the same velocity
α-Particle
The electronic configuration of metal ion M+2 is 2, 8, 14 and its atomic mass is 56. The number of neutrons in its nucleus is;
30
X-rays have wavelength
Greater than cosmic rays
Which of the following has the same number of electrons as α-particle
H+
The wavelength of which of the following pair is the same:
Absorption and Emission spectrum of the same element
In the hydrogen spectrum most energetic transitions of electrons are found in:
Lyman Series
The de-Broglie equation is applicable to only:
Microscopic particles
The last electron in the Na and K can be distinguished by:
Principal Quantum Number
The de Broglie’s wavelength of a particle having momentum 2.2 x 10^-21 kgm/s
3Å
Number o electrons present in 3d subshell of Cu+2:
9
The atomic number of an element is sixteen. It belongs to the period and group number of the periodic table respectively.
3,6
Which contains the most stable orbitals in the valence shell.
O+1
An electron makes a transition from energy state four to two. It will emit a photon of frequency.
E4 - E2 /h
Which order of mass is correct in ascending order:
e < p < n
The radius of the 4th orbit is greater than the first orbit by:
16 times
The radius of the orbit of electron and velocity o electron are:
Inversely proportional to each other
The value of Rydberg’s constant is:
1.09678 x 10^6 m-1
The space between 1s and 2s is called:
Node
The limiting line of the Balmer series lies in;
Ultraviolet region
The wavelength of a photon of light emitted by a certain source is 200 Å. The wave number will be:
5 x 10^7 m^-1
The highest energy electron of an element in the ground state is characterized by the given quantum numbers n=4, l=0, m=0, s=+1/2. The atomic number of the element is;
19
Which formula represents the wave number of electrons:
1.09678 x 10^7 [1/n2 1 - 1/n2 2]
The number of sub-shells in a sulphur atom is;
5
The number of orbitals in a sub-shell can be calculated by the formula:
2l +1
Which specie has the same number of electrons in the valence shell and penultimate (second last) shell?
Cl-1
Which of the following does NOT correctly relate to the arrangement of electrons:
➡Arrangement of a subshell is given by (n+l) rule❌
➡Filling of electrons in degenerate orbitals is given by Hund’s rule❌
➡Filling of electrons in an orbital is given by Pauli’s exclusion principle❌
➡Arragnement of electrons in a shell is given by the octet rule✅
The positive rays have a maximum e/m value when one of the following gas is used in the discharge tube:
N2
Which statement is wrong about quantum numbers:
➡’n’ gives the idea of the energy and size of the orbit❌
➡’l’ gives the shape of an orbital❌
➡’m’ gives the energy of an electron in an orbital✅
➡’s’ gives the direction of spin in an orbital❌
The value of n=3. What are probable values of Azimuthal quantum number ‘l’
0,1,2
Which electronic configuration is not possible?
1s2,2s2 2p6 2d2, 3s1
How many electrons can fit into the sub-shell for which n=3, l=1?
6
Isotopes differ in:
Properties with respect to their mass number
Isotopes are:
➡Chemically Similar
➡Physically Dissimilar
Ionization energy depends upon;
➡Atomic/ionic radii
➡Proton to electron ratio
➡Shielding effect
2nd ionization energy of Mg is higher than the first because:
The nuclear pull for Mg+1 electrons is more than that for the Mg atom
With the increasing atomic number, ionization energy increases over a period because;
➡No change in shielding effect along a period
➡Nuclear pull increases with the increase in number of protons
➡Atomic/ionic size decreases along a period
The correct set of four quantum numbers for the valence electron of rubidium (Z=37) is;
➡n=5
➡l=0
➡m=0
➡s=+1/2
The electronic configuration of K(19) is;
1s2, 2s2 2p6, 3s2 3p6, 4s1
The number of d-electrons in Ffe+2 (Z=26) is not equal to;
p electrons in Ar (Z=18)
The electronic configuration of an element is 1s2 2s2 2p3. This represents a/an:
Ground state
In which of the following, all have the same number of electrons:
➡F-
➡Ne
➡Na+
Identify the correct order of decreasing energy:
3s > 2s > 1s
The shapes of s orbitals are circular and their size:
Increases with the increase in principal quantum number
Quantum number which is not derived from Schrodinger wave equation:
Spin
Shapes of p-orbitals:
Dumb-bell
A correct number of degenerate orbitals:
➡p=3
➡d=5
➡f=7
The ion that is iso-electronic with Cl atom is:
O2-
Which of the following particles would on losing an electron have its outermost p-orbital as half filled:
P-1 ion
The ionic species having more electrons than neutrons is;
O-2
Which pair of electrons of elements will have the same chemical properties
3, 11
An orbital which is spherically symmetrical is:
s-orbital
The value of e/m for the electron is;
1.7588 x 10^11 C/kg
A nodal plane in an orbital is the plane where the electron density is;
Zero
How many times the mass of a neutron is greater than the mass of the electron
1840
The mass of an oxygen atom is;
2.657 x 10^-23 g
The mass of a neutron is;
Slightly more than that of proton
The smallest charge of electricity which has been measured on any particle is;
Charge on an electron
Which of the following has the highest ionization energy value?
He
Does the greater shielding effect correspond to _____ ionization energy value?
Lesser
The mass of a proton is;
1.672 x 10^-27 kg
Which group shows the abnormal behaviour in the trend of ionization energy in periods?
➡Group III-A
➡Group VI-A
The d-orbital which is bi-lobed with a collar is represented as:
dz^2
The correct electronic configuration of Cu is:
[Ar] 3d¹⁰ 4s¹
Which one of the following ions has a similar electronic configuration to Ar
Ti+4
The incorrect statement about d-orbitals;
➡It is not present in the first two principle energy levels❌
➡They are associated with transition elements❌
➡They are five degenerate orbitals it d-subshell❌
➡d-orbitals can fill before p-orbitals in the same principle energy level✅
The shape of the d-subshell is;
Sausage
Incorerect ijnormation about an orbit ois;
➡Circular path for electrons at a definite distance from the nucleus❌
➡Gives the idea of a three-dimensional arrangement of electrons✅
➡Gives no idea of clock-wise or antilock-wise spin of an electron❌
➡Can accommodate the maximum number of electrons according to the 2n^2 formula❌
The second electron affinity value is always with a positive sign. It is due to the repulsion of a second incoming electron with:
Anion
The mass of the α-particle is equal to;
Four times the mass of one proton
Which is not decay product free neutrons;
Anti-Neutron
Quantum number values or 3p orbital are;
n=3, l=1
Arrange the following according to the correct trend of 1st ionisation energies: Na, Mg, Al, P, S
Na < Al < Mg < S < P
Which of the following has maximum 1st ionization energy
N
Which of the following has the highest 2nd ionization energy
Na
In a given period, of the periodic table the family with the lowest 1st ionization energy:
Alkali metals
Which of the following factors do not affect ionization energy across the same period
➡Number of shells
➡Shielding effect
Exceptionally high ionization energies of some groups are due to ___ factor
Nature of orbital
The group(s) show(s) abnormal trends in ionization energy
➡III A
➡VI A
Which of the following has a minimum e/m value?
Neutron
Charge on 1kg of electrons is;
1.7588 x 10^11 C
Which of the following has maximum size:
4s
Maximum number o electrons that can be accommodated in p-orbital
2
Valence electrons of K have ____ value for spin quantum number with _____ spin.
+1/2, Anti-Clock wise
Which of the following quantum number is not mathematically obtained from the Schrodinger wave equation
Spin Quantum number
The maximum number of electrons in electronic configuration can be calculated by using the formula:
2n^
The correct set of quantum numbers for 5f are:
n=5, l=3, m=+1
The rules for filling electrons in subshells of atoms is/are;
Auf-Bau’s principle
Maximum possible values of n+l are;
10
The atomic number of an element is 26. How many electrons are present in the M-shell of this element in the ground state;
14
The electronic configuration of Gold is:
[Xe] 4f14 5d10 6s1
When 6d orbital is completed the entering electron goes into;
7 p
Which of the following orbital is bi-lobed
dz2
Which one of the following represents the most stable configuration of three electrons for the ground state of an element in group IIIA
npx1, npy1, npz1
Which of the following on losing an electron has half filled set of p-orbitals
N-
Which property is the same for two nuclides, Ar and K
Number of nucleons
The group that has maximum 1st ionization energy values:
VIII A
Which one of the following has a maximum electron affinity
Cl
___ is/are isoelectronic with K+.
➡P-3
➡S-2
➡Si-4
The fourth shell can accommodate 32 electrons how many electrons can be placed in the 5th shell?
32
A number of orbitals are required to place all electrons of an element with atomic number 30.
15
A p-orbital has __– energy than the s-orbital of the same principal quantum number
Higher
The total number of neutrons in Ga are:
37
A total number of fundamental nuclear sub-atomic particles are there in an atom :
2
Which of the following has 5 unpaired electrons in d-subshell
➡Mn
➡Cr
➡Fe+3
Which of the following can be directly used to define a quantum number of an atom?
Pauli exclusion principle
The place between two orbitals where the probability of finding the electron is zero is known as;
Nodal Plane
Which one of the following is not an isoelectronic pair:
➡Mg+2
➡Be+2
The e/m value of He+2 ion in comparison to the e/m value of electron is;
7344 times lesser
What will be the longest wavelength line in the Blamer series of spectrum of H atom?
656 nm
According to the Bohr thoery, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
n=6 to n=5
(more higher value of n, more less the value of E)
A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be;
1.0 x 10^-35 m
