Answer:
Magnesium (Mg) belongs to group 2 known as alkaline earth family. The two other elements belonging
to the same group are calcium (Ca) and strontium (Sr). The basis of choice is
the electronic distribution in the valence shell of these elements. All of them have two electrons each.
For example:
K
L
M
N
O
2
8
2
-
-
2
8
8
2
-
2
8
18
8
2
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