Question

protons: 7
neutrons: 8
electrons: 10
0 ▲▼ 3−
n
7
nitrogen

Explanation:

Assuming the problem is to find the mass number of the nitrogen ion:

Step1: Recall mass number formula

Mass number ($A$) = number of protons + number of neutrons.

Step2: Substitute values

Protons = 7, Neutrons = 8. So $A = 7 + 8$.

Step3: Calculate

$7 + 8 = 15$.

Answer:

15

(If the problem was different, e.g., finding charge or something else, adjust accordingly. Since the problem wasn't specified, a common calculation here is mass number.)