Question

how many valence electron(s) do elements in group 1 have
a 2
b 3
c 13
d 1

Explanation:

In the periodic table, the group number of main - group elements (groups 1, 2, 13 - 18) is related to the number of valence electrons. For group 1 elements (such as hydrogen, lithium, sodium, etc.), the general electron configuration of the outermost shell (valence shell) is \(ns^{1}\), where \(n\) represents the principal quantum number of the outermost shell. This means that group 1 elements have 1 valence electron.

Answer:

d. 1