What is the ground-state electron configuration of silicon (Si)?

• A. $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
• C. $1s^{2}2s^{2}2p^{6}3s^{1}3p^3$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$

Answer: (A)