How many electrons can the second shell (n=2) hold at maximum?
A
32
B
18
C
2
D
8
Correct Answer: Option D — 8
Explanation:
Using the formula 2n^2, the second shell (n=2) can hold a maximum of 8 electrons, distributed among the 2s and 2p subshells. This follows the Aufbau and Pauli exclusion principles.