Question

what is the formula for the ionic compound formed by calcium ions and nitrate ions?
a) ca2no3
b) ca3n2
c) ca2no2
d) cano3
e) ca(no3)2

Explanation:

Step1: Determine the charges of ions

Calcium ion (\(Ca^{2+}\)) has a charge of \(+2\), and nitrate ion (\(NO_3^-\)) has a charge of \(-1\).

Step2: Use the criss - cross method

To balance the charges, we need 1 \(Ca^{2+}\) and 2 \(NO_3^-\) ions. So the formula is \(Ca(NO_3)_2\).

Answer:

E. \(Ca(NO_3)_2\)