The calcium ion carries a charge of 2+. The nitrate ion (NO3-) carries a charge of 1-. Which of the following is the correct formula for calcium nitrate?

A. CaN2
B. CaNi
C. CaNO3
D. Ca(NO3)2
C

I change my answer to D

D is right.

The correct formula for calcium nitrate is D. Ca(NO3)2.

To determine the correct formula, we need to balance the charges of the calcium ion and nitrate ion.

The calcium ion has a charge of 2+. This means that it has lost two electrons and has a positive charge of 2.

The nitrate ion has a charge of 1-. This means that it has gained one electron and has a negative charge of 1.

To balance the charges, we need two nitrate ions for every calcium ion. The formula is written with the positive ion (calcium) first, followed by the negative ion (nitrate). Since we need two nitrate ions, we put the NO3 in parentheses and add the subscript 2 outside the parentheses to indicate that there are two nitrate ions.

Therefore, the correct formula for calcium nitrate is Ca(NO3)2.