# What is the identity of a 2nd-row element that has three valence electrons?

Feb 13, 2017

$\text{Boron.........}$

#### Explanation:

Boron, $Z = 5$, has 3 valence electrons: $2 {s}^{2} 2 {p}^{1}$. Carbon, $Z = 6$, has 4 valence electrons: $2 {s}^{2} 2 {p}^{2}$. Nitrogen, $Z = 7$, has 5 valence electrons: $2 {s}^{2} 2 {p}^{3}$. And fluorine, $Z = 7$, has 7 valence electrons: $2 {s}^{2} 2 {p}^{5}$. Of course, these valence electrons are active in the geometry and structure of the compounds of these species.