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Phys, Science Chap 4


Electron A subatomic particle that has a negative charge.
Nucleus An atom's central region,which is made up of protons and neutrons.
Proton A subatomic particle that has a positive charge and that is located in the nucleus of an atom.
Neutron A subatomic particle that has no charge and that is located in the nucleus of an atom.
Atomic Number The number of protons in the nucleus of an atom
Mass Number The sum of the numbers of protons and neutrons in the nucleus of an atom.
Isotope An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass).
Unified Atomic Mass Unit A unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 the mass of a carbon atom with mass number 12 (symbol, u)
Mole The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12g of carbon-12.
Orbital a region in an atom where there is a high probability of finding electrons.
Valence Electron An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties.
Photon A unit or quantum of light.
Created by: osubuckeye1012