Question

The maximum number of electrons in a subshell having same value of spin quantum number is given by:

• A. $l+2$
• B. $2l+1$
• C. $l(l+1)$
• D. $\sqrt{l(l+1)}$

Answer 1

The correct option is B $2l+1$

The spin quantum number is the fourth quantum number, denoted by $s$ or $m_s$. The spin quantum number indicates the orientation of the intrinsic angular momentum of an electron in an atom.

The only possible values of a spin quantum number are +1/2 or -1/2

Maximum number of electron having same spin quantum number is equal to the number of orbitals $=2l+1$