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