Number of Atoms in Ca(NO3)2

To find the number of atoms in Ca(NO3)2 , Calcium Nitrate, we’ll add up the number of atoms for Ca, N, and O. The small number after the element symbol is called the subscript and this tells us how many of that atom are in the compound. For example O3 means there are three oxygen atoms.

When there is no number after an element, as is the case with Calcium (Ca), we assume there to be one atom of that element. For example, in Ca(NO3)2 we have only one Ca atom.

For Ca(NO3)2there are a total of 9 atoms in the compound.

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