Question

how many valence electrons does chlorine have?
o a 35
o b 7
o c 17
o d 3

Explanation:

Step1: Determine the electron configuration of Chlorine

Chlorine has an atomic number of 17. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\).

Step2: Identify valence electrons

Valence electrons are in the outermost shell. For Chlorine, the outermost shell is the 3rd shell (\(3s^{2}3p^{5}\)). The total number of electrons in the 3rd shell is \(2 + 5=7\).

Answer:

b 7