Question

which of the following ions lost two electrons?
li+1
cl-1
mg+2
s-2

Explanation:

Step1: Understand ion charge meaning

A positive - charged ion is formed by losing electrons and a negative - charged ion is formed by gaining electrons. The magnitude of the charge indicates the number of electrons lost or gained.

Step2: Analyze each option

• $\text{Li}^{+1}$: Lithium has lost 1 electron.
• $\text{Cl}^{-1}$: Chlorine has gained 1 electron.
• $\text{Mg}^{+2}$: Magnesium has lost 2 electrons.
• $\text{S}^{-2}$: Sulfur has gained 2 electrons.

Answer:

C. $\text{Mg}^{+2}$