A positively charged particle located in the nucleus is called ________

A negatively charged particle located in the cloud outside of the is called ________

The positively charged central part of an atom is called a(n) _______

A very small particle that makes up most kinds of matter is called a(n) _______

Anything that takes up space and has mass is called a(n) _______

Who discovered the proton and nucleus?

Who discovered the neutron?

Who discovered that each element contains only one kind of atom?

Who discovered the electron?