If an atom loses an electron, it is then positive. If it gains an electron, it is then negative. Review lesson agenda. Atoms are particles that make up an element. The structure of an atom determines it property.
Electrons are smaller and move around in the electron cloud.
Electrons are negative and neutrons are neutral. Students move to the front of the room with only their book, while the Teacher moves the desks back. All students will have the opportunity to act like a proton, electron, or neutron in an atom. Students draw a model of neon. Look at the atomic number, that tells you what.