Question

what number and types of atoms occur in a formula unit of ca(no₃)₂? 1 carbon atom, 1 neon atom, and 6 oxygen atoms 1 calcium atom, 2 neon atoms, and 3 oxygen atoms 1 carbon atom, 1 nitrogen atom, and 3 oxygen atoms 1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms

Explanation:

Step1: Analyze calcium atom count

In $Ca(NO_3)_2$, there is 1 $Ca$ atom as there is no sub - script next to $Ca$.

Step2: Analyze nitrogen atom count

The nitrate ion is $NO_3$. There are 2 nitrate ions due to the sub - script 2 outside the parentheses. Each $NO_3$ has 1 nitrogen atom, so there are $1\times2 = 2$ nitrogen atoms.

Step3: Analyze oxygen atom count

Each $NO_3$ has 3 oxygen atoms. With 2 nitrate ions, there are $3\times2=6$ oxygen atoms.

Answer:

1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms