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Chemistry

Atoms

12th

6 Terms

1
atom
the smallest particle of an element that retains all the properties of that element
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2
atomic number
the number of protons(electrons) in an atom.
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3
isotopes
atoms of the same element with different numbers of neutrons.
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4
mass number
the number after an element's name, representing the sum of its protons and neutrons.
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5
atomic mass unit
one-twelfth the mass of a carbon-12 atom.
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6
atomic mass
the weighted average mass of the isotopes of that element.
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