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Atom The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.
Electrons A tiny, negatively charged particle that moves around of the nucleus of an atom.
Nucleus The central core of an atom which contains protons and neutrons.
Protons Small, positively charged particles that are found in the nucleus of an atom.
Energy level A region of an atom in which electrons of the same energy are likely to be found.
Neutron A small particle in the nucleus of an atom, with no electrical charge.
Atomic number The number of protons in the nucleus of an atom.
Isotopes An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
Mass number The sum of protons and neutrons in the nucleus of an atom.
Atomic mass The average mass of all the isotopes of an element.
Periodic table An arrangment of the elements showing the repeating pattern of their properties.
Chemical symbol A one- or two- letter representation of an element.
Created by: Jon2843