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Published byCecily Price Modified over 6 years ago
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1. The central core of the atom, containing protons and usually neutrons
NUCLEUS
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PROTON Small positively charged particles that are found in the nucleus of an atom
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NEUTRON Small uncharged particles that are found in the nucleus of an atom
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ELECTRON Tiny, negatively charged, high-energy particles that move around outside the nucleus of an atom
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VALENCE ELECTRONS The electrons that are farthest away from the nucleus of an atom and are involved in chemical interactions.
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ELECTRON DOT DIAGRAM A representation of the number of valence electrons in an atom, using dots placed around the symbol of an element
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ATOMIC NUMBER The number of protons in the nucleus of an atom
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GROUP Elements in the same vertical column of the periodic table. Also called family.
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PERIOD Elements in the same horizontal row of the periodic table.
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HALOGEN REACTIVE NON METAL
An element belonging to Group 17 of the periodic table.
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ION An atom or group of atoms that has become electrically charged.
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IONIC BOND The attraction between oppositely charged ions.
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POLYATOMIC ION An ion that is made of more than one atom.
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CRYSTAL An orderly, three-dimensional pattern of ions or atoms in a solid.
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MINERAL A naturally occurring solid that has a crystal structure and a definite chemical composition.
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