what is matter composed of?

Proton

A subatomic particle that has a positive charge

neutron

A subatomic particle that has the same mass as a proton but no electric charge.

electron

A subatomic particle that orbits an atom's nucleus, has a negative electric charge and very little mass

nucleus

The center of an atom, usually containing protons and neutrons

atomic number

The number of protons in an atom

atom

The smallest unit of an element that still has the properties of that element.

plasma

a state of matter made of charged atoms, uncharged atoms and free electrons

compound

a substance made up of atoms of two or more elements that are chemically combined

element

a substance made up of only one kind of atom

metal

a substance that conducts heat and electricity well and that is malleable

non metal

a substance that does not conduct electricity and is not malleable

boiling point

the temperature at which a liquid changes to gas

melting point

the temperature at which solid changes from a solid to a liquid