The has a negative charge. The is smaller than the other particles and can be found outside of the , which is another name for the center of the atom. In the center, there are and . The have no charge but weigh a lot compared to the . The proton has a charge. In order to get the atomic mass, add the number of and together

The electron has a negative charge. The electron is smaller than the other particles and can be found outside of the nucleus, which is another name for the center of the atom. In the center, there are protons and neutrons. The neutron have no charge but weigh a lot compared to the electron. The proton has a positive charge. In order to get the atomic mass, add the number of protons and neutrons together.

Explanation:

electron

?

nucleus

protons

neutrons

neutrons

electrons

positive

protons

protons

neutrons

(because electrons weigh so little it dosnt make a difference)

I believe the best option is A.