Number of electrons having for sodium atom is — Atomic Structure Chemistry Question

💡 Solution & Explanation

The electronic configuration of Na is $1s^2 2s^2 2p^6 3s^1$. For any s-orbital ($l=0$), all electrons have $m=0$. This gives 2 electrons from 1s, 2 from 2s, and 1 from 3s. For the 2p orbital ($l=1$), the $m=0$ state holds 2 electrons. Total $= 2+2+1+2 = 7$ electrons. Therefore, correct answer is C.