Atom Smatters
The basic unit for a chemical
Atom
A chemical substance that can not be broken down
Element
The center of an atom made up of protons and neutrons
Nucelus
A row on the periodic table
Period
A positively charged particle found in all atoms
Proton
A column on the periodic table
Group
Substances that are only made of one type of atom or molecule
Pure Substance
A negatively charged particle found in all atoms
Electron
A system of organizing the elements by atomic mass
Periodic Table
A unit that measures relative masses
A.M.U.
A particle found in the nuclei of all atoms except hydrogen
Neutron
The number of protons in the nucleus of an atom
Atomic Number
The number of protons AND neutrons in the nucleus of an atom
Mass Number