Question

12. Which of the following sets of quantum numbers ( n, l, m _l,m_s) is not allowed?

	a.	2  1  0  +
	b.	2  2  1 +
	c.	3  1  0  –
	d.	5 0  0 +
	e.	4 2  –1 –

14.  Which of the following atoms is the most electronegative?

	a.	Al
	b.	B
	c.	Cs
	d.	N
	e.	Na

15. The Pauli exclusion principle states that

	a.	an electron can have either particle character or wave character.
	b.	no two electrons in the same atom can have the same set of four quantum numbers.
	c.	the wavelength and mass of a subatomic particle are related by .
	d.	both the position of an electron and its momentum cannot be known simultaneously very accurately.
	e.	the wavelength of a photon of light times its frequency is equal to the speed of light.

Answer 1

These are quite simple question

We will solve them one by one

Question 12

The quantum numbers given are

n, l, ml, ms,

The rule is that (l) can have value from 0 to n-1

Which means l cannot be equal ro n

So

Incorrect quantum number set is b

As n and l values are same

Answer

B- 2 2 1 +

Question 14

Al - electronegative value - 1.61

B- 2.04

Cs- 0.79

N- 3.04

Na- 0.93

As we can see most electronegative value is 3.04

Question 15

The paulis exclusion principles states that

no two electrons in the same atom can have the same set of four quantum numbers.

I hope this helps if you have any query or want more detailed explanation feel free to ask in the comments section below.