CM8001

Difference between one carbon atom and another is the differing number of neutrons and electrons.
Difference between carbon and uranium is the differing number of protons, neutrons and electrons, as well as different chemical properties.

N represents the element nitrogen and does not specify the type of isotope. 14N and 15N represent very specific types of isotopes with mass number of 14 and 15 respectively, hence gives the difference in their number of neutrons.

a. 94 protons
b. 93 protons – Neptunium, 94 protons – plutonium
c. 86 protons

a. Control rod assembly
b. Cooling water out of the core
c. Control rods
d. Cooling water into the core
e. Fuel rods