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TE Chem Ch 3

Atom The smallest unit of an element that maintains the properties of that element
Atomic Mass Unit A unit of mass used for measuring the mass of atoms. It is exactly 1/12 the mass of a carbon-12 atom, or 1.660x10^-27 kg
Atomic Number The number of protons in the nucleus of each atom of an element
Average Atomic Mass The weighted average of the atomic masses of the naturally occurring isotopes of an element
Isotope Atoms of the same element that have different masses due to different numbers of neutrons
Mass Number The total number of protons and neutrons in the nucleus of an isotope
Proton The positive part of the atom, found in the nucleus, determines the identity of the element
Electron The negative part of the atom, found outside the nucleus
Neutron The part of the atom with no charge, found in the nucleus
Nucleus The center area in an atom
Ion An atom that has lost or gained one or more electrons
Period A horizontal row on the periodic table
Group A vertical column on the periodic table
Anion A negative ion
Cation A positive ion
Created by: kost