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16 Cards in this Set

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Atom
The smallest unit of matter that retains the properties of an element
Neutron
A subatomic particle having an electrical charge (electrically neutral), with a mass of about 1.7 x 10-24g, found in the nucleus of an atom
Electron
A subatomic particle with a single negative electrical charge, and a mass about 1/2000 that of a neutron or proton. One or more electrons move around the nucleus of an atom
Protons
A subatomic particle with a single electrical charge, with a mass of about 1.7 x 10-24 g, found on the nucleus of an atom
Atomic nucleus
An atoms dense central core, containing protons and neutrons
Mass number
The sum of the number of protons and neutrons in an atoms nucleus
Atomic mass
The total mass of an atom, which is the mass in grams of one mole of the atom.
Isotopes
One of severa atomic forms of an element, each wuth the same number of protons but different number of neutrons, thus differing in atomic mass
Radioactive Isotope
An isotope that is unstable, the nucleus decays spontaneously, give off detectable particles and energy.
Energy
The capacity to change things, especially to do work and move matter against opposing force.
Potential Energy
The energy that matter possesses as a result of its location or spacial arrangement (structure).
Electron shells
An energy level of elecyrons at characteristic aerage distrances from the nucleus of an atom.
Valence electrons
The outermost energy shell in an atom containing the valence electrons involved in the chemical reactions of that atom.
Outermost shell
The outermost energy shell, in an atom, containing the valence electrons involved in the chemical reactions of an atom.
Valence Shells
The outermost energy shell, in an atom, containing the valence electrons involved in the chemical reactions of an atom
Orbital
The 3D space where an electron is found 90% of the time.