# What isotope has 14 protons and 14 neutrons?

""^28Si
If there are 14 protons, then, $Z$, the atomic number is $14$. Why? Because $Z$ is by definition the number of positively charged, massive nuclear particles. And $Z$ defines the identity of the atom; if $Z = 14$, we gots $\text{silicon........}$
Because the element may contain more or less NEUTRONS than $Z$, where neutrons are massive, neutrally charged, nuclear particles, the isotope is ""^28Si, about 92.2% abundant.
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