Atomic Structure

Question 1

Atoms are made of up of?

Answer 1

Protons, neutrons and electrons

Question 2

Nucleus is comprosed of?

Answer 2

Neutrons+protons

Question 3

What is Z?

Answer 3

Atomic number

Question 4

What is A?

Answer 4

Atomic mass

Question 5

Charge on e-?

Answer 5

-1.6 X 10e-19

Question 6

Charge on proton ?

Answer 6

1.6 X 10e-19

Question 7

Charge on neutron?

Answer 7

No charge = neutral

Question 8

What are isotopes

Answer 8

Same atomic number but different mass numbe r

Question 9

Mass of e- is ________of protons

Answer 9

1/2000

Question 10

Which force is stronger? Gravitational or electrostatic ?

Answer 10

Electrostatic is much stronger

Question 11

_______electrons take part in bonding.

Answer 11

Valence

Question 12

In a neutral atom, number of protons is ______to the number of electrons

Answer 12

=

Question 13

_____determines the charge on atom?

Answer 13

Electrons

Question 14

_______determines atomic number

Answer 14

Protons

Question 15

_______determines isotopes

Answer 15

Neutrons

Question 16

Are atomic mass and atomic weight the same ?

Answer 16

NO . They might seem same, they are not. Atomic weight is the average weight of an atom when isotopes are considered as well.
If an isotope is super abundant, then the atomic mass would be almost equal to atomic weight

Question 17

How many atoms are there in one mole?

Answer 17

Avogadro’s number = 6.022X10e23

Question 18

Define one mole of carbon in grams and atoms

Answer 18

12g
6.022X10e23

Question 19

Give planks relation

Answer 19

E=hf =hc/w

H-planks constant - 6.626X10e-34
F- frequency
C speed of light -3X10e8
W- wavelength

Question 20

Give relation for angular momentum of an e?

Answer 20

L=nh/2pie

N- she’ll

Question 21

Rh?

Answer 21

Rydbergs constant = 2.18X10e-18 j/e

Question 22

Define orbit?

Answer 22

Fixed pathway around the nucleus for an e to move

Question 23

________is when an atom is at the lowest energy level

Answer 23

Ground state

Question 24

The amount of energy emitted by an electron moving from a higher energy to lower is equal to the energy required to jump from the same lower level to upper ? Is this true?

Answer 24

Yes

Question 25

Energy emitted or required equation

Answer 25

E=hf= Rh ((1/nie2)-(1/nfe2))

Question 26

Explain hydrogen emission spectrum

Answer 26

Lyman series = 0- n=1,2,3….
Balmer series = 1-n=2,3,4….
Pashcen series = 2-n=3,4,5….

Question 27

The color we see is because?

Answer 27

Of absorption. The color of the light that is not absorbed is visible to us

Question 28

The color we see is because?

Answer 28

Of absorption. The color of the light that is not absorbed is visible to us

Question 29

Define orbitals ?

Answer 29

3D spaces where the probability of finding an e is the max

Question 30

_______principle explains how it is impossible to simultaneously determine the accurate position and momentum of an e at the same time

Answer 30

Heisenberg uncertainty

Question 31

Explain different quantum number

Answer 31

N= principal quantum number -info about the orbit

L = azimuthal quantum number - info about the subshell

Ml- magnetic quantum number - info about specific orbital

Ms- spin quantum number - info about spin (either -.5 or +.5)

Question 32

Shape of s orbital?

Answer 32

Spherical

Question 33

Shape of p orbital

Answer 33

Dumbbell

Question 34

Explain aufbhau principle

Answer 34

It’s the order in which orbital should be filled

1s-2s-2p-3s-3p-4s-3d- 4p-5s-4d-5p-6s-4f-5d-6p-7s-5f-6d-7p

Question 35

What is Hunds rule?

Answer 35

Orbital are first filled with 1 electron before pairing starts

Question 36

Stability trend for orbitals ?

Answer 36

Fully filled>half filled> partially filled

Question 37

Unpaired electrons in magnetic field ?

Answer 37

Paramagnetic = cause parallel spin

Question 38

Paired electrons in magnetic field?

Answer 38

Diamagnetic = repell.

Levitation only possible in these