5.1- Electron Structure

Question 1

What does the principal quantum number indicate?

Answer 1

The shell occupied by the electrons

Question 2

How many electrons can the 1st shell hold?

Answer 2

2

Question 3

How many electrons can the 2nd shell hold?

Answer 3

8

Question 4

How many electrons Can the 3rd shell hold?

Answer 4

18

Question 5

How many electrons can the 4th shell hold?

Answer 5

32

Question 6

What is an orbital?

Answer 6

A region around the nucleus that can hold up to 2 electrons with opposite spins

Question 7

What are the 4 types of orbitals?

Answer 7

• S orbital
• P orbital
• D orbital
• f orbital

Question 8

What is the shape of a s-orbital?

Answer 8

Spherical

Question 9

What is the shape of a p-orbital?

Answer 9

Dumb -bell shape

Question 10

Hour many orbitals are foundin a s subshell?

Answer 10

1

Question 11

How many electrons can be held in a S sub shell ?

Answer 11

2

Question 12

How many orbitals does a P sub shell have ?

Answer 12

3

Question 13

How many electrons can be held in a p subshell?

Answer 13

6

Question 14

Hour many orbitals are present in a D subshell?

Answer 14

5

Question 15

How many electrons can be held in a d sub shell ?

Answer 15

10

Question 16

How many orbitals are found in a F subshell ?

Answer 16

7

Question 17

How many electrons can fill F subshell?

Answer 17

14

Question 18

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

Answer 18

• 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 19

Why does 4s orbital fill before 3d orbital?

Answer 19

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

Question 20

How do electrons pair and why?

Answer 20

•The 2 electrons in an orbital must have opposite spins
• this helps to counteract the repulsion between the negative charges of the two electrons