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15 Cards in this Set

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Atom
The smallest particle of an element that retains its identity in a chemical reaction
Atomic Mass
The weighted average of the masses of the isotopes of an element
Atomic Mass Unit
A unit of mass equal to one-twelfth the mass of a carbon-12 atom
Atomic Number
The number of protons in the nucleus of an atom of an element
Cathode Ray
A stream of electrons produced at the negative electrode (cathode) of a tube containing a gas at low pressure
Dalton's atomic theory
The first theory to relate chemical changes to events at the atomic level
Electron
A negatively charged subatomic particle
Group
A vertical column of elements in the periodic table, the constituent elements of a group have similar chemical and physical properties
Isotopes
Atoms of the same element that have the same atomic number but different atomic masses due to a different number of neutrons
Mass Number
The total number of protons and neutrons in the nucleus of an atom
Neutron
A subatomic particle with no charge and a mass of 1 amu; found in the nucleus of an atom
Nucleus
The tiny, dense central portion of an atom, composed of protons and neutrons
Period
A horizontal row of elements in the periodic table
Periodic Table
An arrangement of elements in which the elements are separated into groups based on a set of repeating properties
Proton
A positively charged subatomic particle found in the nucleus of an atom