The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for magnesium chloride?
A) MgCl
B) MgCl₂
C) Mg₂Cl
D) MgCl₃

Question

Quizplus · Accepted Answer

To form a neutral compound, the positive charge of magnesium ion (with a charge of 2+) has to balance the negative charge of chlorine ion (with a charge of 1-). Therefore, we need two chloride ions for one magnesium ion, resulting in the formula MgCl₂.

The Atomic Number of Chlorine Is 17