A) \[n\]
B) \[2n\]
C) \[{{n}^{2}}\]
D) \[2{{n}^{2}}\]
Correct Answer: D
Solution :
Maximum number of electrons in a shell will principal quantum number n is given by\[2{{n}^{2}}\]. for e.g., if\[\underset{(first\text{ }shell)}{\mathop{n=1}}\,,\]number of\[{{e}^{-}}=2\times {{1}^{2}}\] = 2 electrons
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