Question

ag(no3)2
ag: ____
n: ____
o: ____

Explanation:

Step1: Count silver atoms

The sub - script outside the parentheses does not affect the single atom of Ag. So, there is 1 Ag atom.

Step2: Count nitrogen atoms

The nitrate ion is $NO_3^-$. Inside the parentheses, there is 1 N atom, and the sub - script 2 outside the parentheses multiplies the number of all atoms inside the parentheses. So, the number of N atoms is 2.

Step3: Count oxygen atoms

Inside the $NO_3$ group, there are 3 O atoms. With a sub - script of 2 outside the parentheses, the number of O atoms is $3\times2 = 6$.

Answer:

Ag: 1
N: 2
O: 6