Select the correct answer.
Magnesium is an alkaline earth metal with an atomic number of 12. It's in the third row in the
periodic table. Which expression shows one way to find the number of valence electrons in one
atom of magnesium?
OA.
12 x 3
OB
12-3
Oc.
(12-8)-2
OD
(12-2) + 8
OE.
(12 + 2) - 8
Answers: 2
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