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CHEMHACK XI > 2. Structure of Atom > Flashcards

2. Structure of Atom Flashcards

1
Q

Cathode rays originate from cathode. T/F

A

T

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2
Q

Charge to mass ratio was determined by the scientist -

A

JJ Thomson

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3
Q

Charge to mass ratio was determined by the scientist -

A

RA Milikan

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4
Q

Neutron was discovered by the scientist -

A

Chadwick

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5
Q

Charge of electron is -

A
  • 1.6 * 10 ^ - 19 * C
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6
Q

Mass of electron is - (NEET 2023)

A

9.1 *10 ^ - 31 * kg

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7
Q

Mass of proton is -

A

1.67 * 10 ^ - 27 * kg

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8
Q

Rutherford gold foil was _______ atoms thick.

A

1000

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9
Q

Define isobars

A

atoms with same mass number but different atomic number

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10
Q

All the isotopes of a given element show same chemical behaviour. T/F (NEET 2023)

A

T

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11
Q

The radius of nucleus are usually expressed in terms of _______ Unit

A

fermi

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12
Q

Define wave number

A

l / lambda

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13
Q

SI unit of wave number is -

A

m ^ - 1

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14
Q

Wavelength of visible spectrum of light varies from ______ nm to _____ nm.

A

400-750

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15
Q

What is a black body?

A

The ideal body, which emits and absorbs radiations of all frequencies, is called a black body

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16
Q

Planck constant value -

A

6.626 x 10-34 Js

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17
Q

Work function is equal to -

A

hv₀

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18
Q

Planck’s law -

A

E = hv

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19
Q

Photoelectric effect equation -

A

hv = hv₀ + mv²/2

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20
Q

Balmar series is described by the formula -

A
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21
Q

Rydberg constant value -

A

109,677 cm-¹ or 2.18 x 10-¹⁸ J

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22
Q

The name of respective series for n₁ = 1, 2, 3, 4, 5, 6 is -

A

Lyman, Balmer, Paschen, Bracket, Pfund,
Humphrey

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23
Q

Which series of transitions in the spectrum of H atom falls in visible region? (NEET) (JEE 2021)

A

Balmar

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24
Q

According to Bohr, the angular momentum of an electron in a given stationary state can be expressed as

A

mur = nh/21π

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25
Q

rn = _______ (NEET 2022)

A

rn = agn²/Z where a₀ = 52.9 pm

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26
Q

En =

A

-218 x 10-¹⁸ (Z²/n²)

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27
Q

Velocity(Vn) =

A
  1. 2.18 x 106 (Z²/n²)
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28
Q

Κ.Εn =

A

2.18 x 10-¹⁸ (Z²/n²)

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29
Q

P.En =

A

4.36 x 10-¹⁸ (Z²/n²)

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30
Q

Frequency(vn) =

A
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31
Q

(Wave number)n =

A
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32
Q

Time taken to complete one revolution is proportional to which powers of n & Z?

A
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33
Q

Total number of spectral lines obtained in H atom (when electron jump from n2 to n1) equal to -

A
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34
Q

The Bohr model could not explain the ability of atoms to form molecules by chemical bonds T/F

A
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35
Q

Splitting of spectral lines in the presence of magnetic field is called -

A
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36
Q

Splitting of spectral lines in the presence of electric field is called -

A
37
Q

Bohr was able to explain the occurrence of Zeeman and Stark effect T/F

A
38
Q

Describe Heisenberg’s Uncertainty Principle and write its equation (JEE)

A

It states that it is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of or an electron
∆x ∆px greater or equal to h/4π
or
∆x ∆vx greater or equal to h/4πm

39
Q

When an electron is in any energy state, the wave function corresponding to that energy state contains all information about the electron. T/F

A

T

40
Q

The energy of electrons in atoms is not quantized. T/F

A

F

41
Q

The number which identifies the shell is -

A

Principal quantum number

42
Q

Azimuthal quantum number is also called _______ or _______

A

orbital angular momentum or subsidiary quantum number

43
Q

________ identifies the three dimensional shape of the Orbital

A

Azimuthal quantum number

44
Q

For n = 3, tell the possible values of I (JEE)

A

l = 0, 1, 2

45
Q

For any subshell I ______ values of m are possible (NEET 2023)

A

2l +l

46
Q

________ number refers to the orientation of spin of electrons.

A

Spin quantum number

47
Q

Spin angular momentum of the electron is a vector quantity. T/F

A

T

48
Q

_______ gives information about the spatial orientation of the orbital with respect to standard set of co- ordinate axis. (NEET)

A

Magnetic orbital quantum number

49
Q

For I = 2, m can be -

A

+2, +1, 0, -1, -2

50
Q

Subsidiary quantum number also determine the energy of the orbital to some extent. T/F

A

T

51
Q

What is the total no. of orbitals associated with n = 3?

A

Total no. of orbitals = n². Hence 3² = 9

52
Q

A 4s orbital have ________ number of nodes

A

3

53
Q

Boundary surface diagrams enclose the area where probability of finding electrons is _______

A

90%

54
Q

Electron is located further away from the nucleus as the principal quantum number increases T/F

A

T

55
Q

There is no simple relation between the values of m (-I, 0 and +I) and the x y and z directions. T/F

A

T

56
Q

Maximum no of electrons in a subshell I = (NEET)

A

4l + 2

57
Q

Total no. of nodes =

A

n-l

58
Q

Angular nodes =

A

I (azimuthal quantum number)

59
Q

Radial nodes =

A

n- I (azimuthal quantum number) - 1

60
Q

What are angular nodes?

A

Nodal planes passing through origin which have zero probability of electrons

61
Q

Angular momentum of the electron in an orbital - (NEET)

A

(h/2π) √l[(l + l)]

62
Q

Angular momentum of the electron in an orbital - (NEET)

A

(h/2π) √[s(s + l)]

63
Q

Spin multiplicity-

A

2s + 1

64
Q

No. of sub shells in nth shells-

A

n

65
Q

No. of orbitals in nth shell-

A

n²

66
Q

What is the main reason for having different energies of the subshells in multi-electron species?

A

Mutual repulsion among the electrons

67
Q

In general, the repulsive interaction of the electrons in the outer shell with the electrons in the inner shell are more important. T/F

A

T

68
Q

Despite the shielding of the outer electrons from the nucleus by the inner shell electrons, the attractive force experienced by the outer shell electrons increases with increase of nuclear charge. T/F

A

T

69
Q

p-orbital electron spends more time close to the nucleus in comparison to s orbital T/F

A

F

70
Q

The Zeff experienced by the electron increases with increase of azimuthal quantum number (D. T/F

A

F

71
Q

If two orbitals have same value of (n + 1), then how will we decide when one is lower in energy?

A

The one with lower value of n will have lower energy

72
Q

Energies of the orbitals in the same subshell decrease with increase in the atomic number (Zeff). T/F

A

T

73
Q

In the H atom, 4s have less energy than 3d. T/F

A

F

74
Q

Energy of 2s orbital of hydrogen atom is greater than that of 2s orbital of lithium. T/F

A

T

75
Q

Aufbau principle is based on - (3)

A

Pauli’s exclusion principle, the Hund’s rule of maximum multiplicity and the relative energies of the orbitals

76
Q

Write order of filling orbitals till Is orbital.

A

Is, 2s 2p 3 s, 3p 4s, 3d, 4p, 5s 4d, 5p 6s, 4f, 5d, 6p, 7s
[Trick - Remember this sequence - S SP SP SDP SDP SFDP SFDP {which implies - Is (S) 2s 2p (SP) 3s 3p (SP) 4s 3d 4p (SDP)…) Using this, you will not have to make that hard diagram of Order of filling every time]

77
Q

What is Pauli Exclusion Principle? (NEET)

A

No two electrons in an atom can have the same set of four quantum numbers

78
Q

The maximum number of electrons in the shell with principal quantum number n is equal to -

A

2n²

79
Q

What is Hund’s Rule?

A

pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied

80
Q

What are valence electrons ?

A

electrons that are added to the electronic shell with the highest principal quantum number are called valence electrons

81
Q

Write electronic configuration of Cr

A

[Ar] 3d⁵ 4s¹

82
Q

Write electronic configuration of Cu

A

[Ar] 3d¹⁰ 4s¹

83
Q

Fully filled orbitals and half filled orbitals have extra stability. T/F

A

T

84
Q

Causes of stability of completely filled and half filled subshells are - (2)

A

Causes of stability of completely filled and half filled subshells are
(i) Symmetrical distribution of electrons
(ii) exchange energy

85
Q

Atoms of all elements are composed of two fundamental particles. T/F (NEET 2023)

A

T

86
Q

Protons and electrons are collectively known as nucleons. (NEET 2023)

A

F, Protons and neutron are collectively known as nucleons

87
Q
A

DigaQ. I
A-Is
B-2s

88
Q

DigaQ. 2. This is the boundary surface diagram of - (NEET 2022)

A

DigaQ. 2- Boundary surface diagrams of 3d orbitals
A-d(yz)
B-d(x²-y²)
C-d(z²)

CHEMHACK XI (16 decks)

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