Arturo O. answered • 06/07/20

Experienced Physics Teacher for Physics Tutoring

I will do one of these, then you apply the same reasoning to answer the others.

^{59}**Co**

Look up the atomic number (Z) for cobalt.

Z = 27

That is the number of protons, which is the same as the number of electrons. The mass number is

A = 59,

so the number of neutrons is

A - Z = 59 - 27 = 32

In these problems, they gave you A, so apply this same reasoning and try to answer the other questions.