Question

If l = 2 and n = 3 for any atom then maximum number of electron is:

• A. 2
• B. 6
• C. 12
• D. 10

Answer 1

Answer: (D)

10

Number	Symbol	Possible values
Principal quantum number	$n$	$1,2,3,4,....$
Azimuthal quantum number	$l$	$0,1,2,3,....,(n-1)$
Magnetic quantum number	$m_l$	$-l,...,-1,0,1,....,l$
Spin quantum number	$m_s$	$+1/2,-1/2$

In this case l = 2

then $m_l=-2,-1,0,+1,+2$

so there are 5 orbitals and each orbital contain 2 electrons

So for value n = 3 and l= 2 there are 10 electrons.