1.1 Atomic Structure (Booklet 1 of 8)
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9 Terms
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Atomic number
The number of protons in the nucleus of an atom.
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Mass number
The total number of protons and neutrons in the nucleus of an atom.
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Isotopes
Isotopes are atoms of an element with the same atomic number but a different mass number.
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Ion
A charged particle formed when an atom gains or loses electrons.
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Cation
A cation is a positive ion.
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Anion
An anion is a negative ion.
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Atom
The simplest particle of an element that can exist on its own in a stable environment.
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Group
Vertical column in the periodic table.
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Period
Horizontal row in the periodic table.
Note 
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