* Ba(NO3)2 represents the chemical formula for Barium Nitrate.

* Ba is the symbol for Barium.

* (NO3) is the nitrate ion, which consists of one Nitrogen atom (N) and three Oxygen atoms (O).

* The subscript 2 outside the parentheses means there are two nitrate ions in each molecule of Barium Nitrate.

Therefore, the total number of oxygen atoms in Ba(NO3)2 is:

3 oxygen atoms per nitrate ion * 2 nitrate ions = 6 oxygen atoms