41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons.

This is what I got-
Protons: 19
Neutrons: 20
Electrons: ?

Thanks
-MC

4 answers

**Not US History, haha

-MC

The electrons must be the same as the protons, or, Lord help us, each atom would be repulsively charged.

So..19, right?

Thanks!
-MC

yes, 19