Module 2 - Electron Structure

Question 1

What does the principal
quantum number indicate?

Answer 1

The shell occupied by the electrons

Question 2

What is a shell?

Answer 2

A group of orbitals with the same
principal quantum number

Question 3

How many electrons can the
1st shell hold?

Answer 3

2

Question 4

How many electrons can the
2nd shell hold?

Answer 4

8

Question 5

How many electrons can the
3rd shell hold?

Answer 5

18

Question 6

How many electrons can the
4th shell hold?

Answer 6

32

Question 7

What is an orbital?

Answer 7

A region around the nucleus that can
hold up to two electrons with opposite
spins

Question 8

How many electrons can an
orbital hold?

Answer 8

2

Question 9

What are the 4 types of
orbitals?

Answer 9

● s orbital
● p orbital
● d orbital
● f orbital

Question 10

What is the shape of a
s-orbital?

Answer 10

Spherical

Question 11

What is the shape of a
p-orbital?

Answer 11

Dumb-bell shape

Question 12

How many orbitals are found
in a S subshell?

Answer 12

1

Question 13

How many electrons can be
held in a S subshell?

Answer 13

2

Question 14

How many orbitals does P
subshell have?

Answer 14

3

Question 15

How many electrons can be
held in a P subshell?

Answer 15

6

Question 16

How many orbitals are present
in a D subshell?

Answer 16

5

Question 17

How many electrons are present
in a D subshell orbital?

Answer 17

10

Question 18

How many orbitals are found
in a F subshell?

Answer 18

7

Question 19

How many electrons can fill F
subshell?

Answer 19

14

Question 20

What letter used to represent
shell number?

Answer 20

n

Question 21

From which shell onwards is S
orbital present?

Answer 21

n=1

Question 22

From which shell onwards is
P-orbital present?

Answer 22

n = 2

Question 23

From which shell onwards is
D-orbital present?

Answer 23

n = 3

Question 24

From which shell onwards is
F-orbital present?

Answer 24

n = 4

Question 25

What are the rules by which
electrons are arranged in the
shell?

5 points

Answer 25

● Electrons are added one at a time
● Lowest available energy level is filled first
● Each energy level must be filled before the
next one can fill
● Each orbital is filled singly before pairing
● 4s is filled before 3d

Question 26

Why does 4s orbital fill before
3d orbital?

Answer 26

4s orbital has a lower energy than 3d
before it is filled

Question 27

What is the electron
configuration of krypton?

Answer 27

1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6

Question 28

Which electrons are lost when
an atom becomes a positive
ion?

Answer 28

Electrons in the highest energy levels