# Which atoms have "4 valence electrons?" "A. carbon and silicon" "B. boron and argon" "C. aluminum and calcium;" "D. potassium and magnesium;" "E. none of the above."

Jun 13, 2017

$\text{Answer A..............}$

#### Explanation:

$\text{Carbon}$ and $\text{silicon}$ BOTH come from $\text{Group 14}$ of the $\text{Periodic Table}$, i.e. both formally have the same number of valence electrons, 4 such electrons.........

On the other hand, $\text{boron}$, and $\text{argon}$ have 3 and 8 valence electrons respectively.

$\text{Aluminum}$ and $\text{calcium}$ have 3 and 2 valence electrons respectively.

And $\text{potassium}$ and $\text{magnesium}$, have 1 and 2 such electrons.

And if you are doing your chemistry homework, there SHOULD be a Periodic Table in front, that graphically gives you the electronic structure. Is there? And if it is there you still have to learn how to use it effectively.