Atoms- Grade 9
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Last updated 10:33 PM on 3/29/23
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10 Terms
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Protons
Positively charged particles
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Neutrons
the particles of the nucleus that have no charge
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Electron
a negatively charged subatomic particle
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Ion
An atom or group of atoms that has a positive or negative charge.
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valence electrons
electrons in the outermost shell
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atomic mass
the weighted average of the masses of the isotopes of an element
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mass number
the total number of protons and neutrons in the nucleus of an atom
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Isotopes
Atoms of the same element that have different numbers of neutrons
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Nucleus
Center of an atom
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subatomic particles
protons, neutrons, and electrons; make up atoms\#
