Question

How are A (mass number), Z (atomic number), and N (number of neutrons) related?

a
Z = A + N
b
N = Z + A
c
A = Z + N
d
Z = A = N

Answer 1

I'm thinking it's C?

Answer 2

Correct

(mass number) = (atomic number) + (number of neutrons)
which is the same as saying
(mass number) = (number of protons) + (number of neutrons)

The atomic number and the number of protons are the same because the number of protons directly and uniquely defines what element we're working with.

Example: 8 protons means we have oxygen, so this element has atomic number 8 on the periodic table

Answer 3

The mass of an electron is so very small relative to a proton that electrons don't contribute much mass to the overall element. That's why we only consider protons and neutrons.

Answer 4

thank you

Answer 5

sure thing