Answer:
On the outside or something like that
The answer should be B. hope this helped ;)
It defines the element. If you change the protons, you change the type of element. A proton is positively charged and is most of the mass of the atom, next to the neutron. Neutrons have a very very very slightly higher mass.
I believe the a is the correct answer is d
It’s x200 plus 300 that’s why it is that answer
