answer choices
a. 13
b. 15
c. 28
d. 30
:))

Answer:
15 neutrons
Explanation:
Number of neutrons = atomic mass - number of protons.
So Neutrons = 28 - 13 protons
(Since atom is neutral, number of electrons = number of protons, which is how I get the 13 protons)
Neutrons = 15