Question

sulfur has 16 electrons. after it bonds with magnesium it acquires a 2- charge. how many electrons does the s²⁻ ion contain?
select one:
a. 2
b. 8
c. 16
d. 18

which of the following is the correct formula for the compound formed from the elements beryllium and oxygen?
select one:
a. beo
b. be₂o₂
c. beo₃
d. be₄o₈

Explanation:

Step1: Calculate S²⁻ electron count

A neutral S atom has 16 electrons. A 2⁻ charge means it gains 2 electrons:
$16 + 2 = 18$

Step2: Find Be-O compound formula

Beryllium forms $Be^{2+}$, oxygen forms $O^{2-}$. Charges balance in a 1:1 ratio, so the formula is $BeO$.

Answer:

1. d. 18
2. a. BeO