Question

group 2
4
be
beryllium
9.012
12
mg
magnesium
24.305
how many valence electrons are in magnesium?
1
a
2
b
3
c

Explanation:

Step1: Locate magnesium in periodic table

Magnesium (Mg) has atomic number 12.

Step2: Determine electron - shell configuration

The electron - shell configuration of Mg is 2, 8, 2.

Step3: Identify valence electrons

Valence electrons are in the outermost shell. So, Mg has 2 valence electrons.

Answer:

B. 2