2.2 Quantum Numbers

Question 1

Explain emission spectra of elements. What do they provide? When is that?

Answer 1

Emission spectra of elements with more than one atom provide evidence of sub-levels within each principal energy level above the first.

Question 2

What does Quantum Theory define?

Answer 2

the allowed energy levels of electrons by four quantum numbers

Question 3

What is a rule to remember when talking about quantum numbers?

Answer 3

No two electrons can have the same four quantum numbers

Question 4

Explain the table stating what quantum numbers are

Answer 4

Electron in atom - Position
Principal QN - Shell
Second QN - Sub-shell
Third QN - Direction 
Fourth QN - Spin

Question 5

What is Principal Quantum Number? What’s the symbol for it?

Answer 5

n

It determines the main energy level. The number determine the size and energy of the shell

Question 6

What is Angular Momentum Quantum Number? What is the symbol for it too?

Answer 6

Determines the shape of the sub-shell and is labelled as s,p,d. This can have values from 0 - (n-1)

Question 7

What is the Second Quantum Number?

Answer 7

It’s also known as the Angular Momentum Quantum Number.

Question 8

What are the values of s, p, d?

Answer 8

s - 0
p - 1
d - 2