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NEET 1989 (AIPMT) · Quantum Numbers, X-rays & Other Questions

Quantum Numbers, X-rays & Other Questions question from NEET 1989 (AIPMT)

Q13NEET 1989 · AIPMTEasy

Quantum Numbers, X-rays & Other Questions

The atomic number of silicon is 14. Its ground state electron configuration is

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Answer: (d)

Fill 14 electrons in order $1s, 2s, 2p, 3s, 3p$ ; $2p$ holds at most 6.
$1s^2\,2s^2\,2p^6\,3s^2\,3p^2$ (total $2+2+6+2+2 = 14$ )
So the answer is (d).

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