### Question 2.67

NCERT Class XI Chemistry

(a) How many subshells are associated with n = 4 ? (b) How many electrons will be present in the subshells having ms value of -1/2 for n = 4

### Solution in Detail

(video solution below this)

$\displaystyle \underline{\underline{\text{Part (a)}}}$

subshells in principal quantum number $\displaystyle n$ are $\displaystyle n^2$

$\displaystyle \therefore $ subshells for $\displaystyle n = 4$ are $\displaystyle 4^2 = 16\:\underline{Ans}$

$\displaystyle \underline{\underline{\text{Part (b)}}}$

Each subshell can have only one electron of

spin $\displaystyle m_s = -1/2$

$\displaystyle \therefore $ total electrons of spin -1/2 will also be $\displaystyle 16\:\underline{Ans}$

### Video Explanation

Please watch this youtube video for a quick explanation of the solution:

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