proton

neutral particle

proton (what does p stand for?)

positive particle (p stands for positive)

neutron (n stands for what)

neutral particle (no + or -)

electron cloud

around nucleous where electrons are found

nucleus

center

Mixture: 

matter that can vary in composition 

Element:

A substance that is made of just one type of atom

Substance:

matter with a composition that is always the same