Question

how many neutrons does this atom have? charge neutral mass 26 electrons 12 neutrons?

Explanation:

Step1: Recall atomic - mass formula

The atomic mass ($A$) is the sum of the number of protons ($p$) and neutrons ($n$), i.e., $A=p + n$. In a neutral atom, the number of electrons is equal to the number of protons. Given electrons = 12, so protons $p = 12$. Given mass number $A=26$.

Step2: Calculate number of neutrons

We use the formula $n=A - p$. Substitute $A = 26$ and $p = 12$ into the formula: $n=26-12$.
$n = 14$

Answer:

14