atom
smallest particle of an element
Electrons
negatively charged particles in an atom.
Nucleus
positively charged center in an atom.
Protons
positively charged particle in an atom
Cloud Model
Electron cloud where electrons are in levels
Chadwick
found neutrons
neutrons
nuetral particle in an atoms nucleus
Atomic Number
the number of protons in the nucleus of an atom.
Isotopes
Atoms of the same element that different numbers of neutrons
Mass Number
The number of protons + the number of neutrons in the nucleus.
Atomic Mass Number
The average mass numbers of all known isotopes.
ion
an atom or group of atoms that has a positive or negative charge.