Question

1. how many valence electrons are in an atom of silicon?

a) 2

b) 3

c) 4

d) 5

Explanation:

Identify the atomic number of silicon

$$ Z = 14 $$

Determine the electron configuration

$$ 1s^2 2s^2 2p^6 3s^2 3p^2 $$

Count the outermost shell electrons

$$ n = 3 \implies 3s^2 3p^2 \implies 2 + 2 = 4 $$

Answer:

• (A) 2
• (B) 3
• (C) 4 (Correct answer)
• (D) 5