The first number is the atomic mass. This is the total number of protons and neutrons
The second is atomic number, this is the number of protons-this number will never vary or change within that element because the number of protons is what makes an element that element
So to find the number of neutrons, you subtract the second number from the first.
The number of electrons is the same as the number of protons unless there is an additional charge which none of these have
A) neutrons: 132-55=77 neutrons
Protons:55
Electrons: 55
B)n: 59-27=32
27p
27e
C)163-69=94
69p
69e
D)70-30=40 n
30p
30e
Hope that helped!
