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Alkali Metals
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Any of the highly reactive elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group 1A
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Alkaline Earth Metals
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Group 2A.
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Anion
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A ion negative charge.
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Atomic Radius
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Is one half of the distance between the nuclei of two atoms of the same elements when the atoms are joined.
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Cation
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Ion with a positive charge
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Electronegativity
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Is the ability of an atom of an element to attract electrons when the atom is in a compound.
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Halogens
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Non-metals (Group 7A)
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Inner Transition Metal
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The highest occupied s sublevel and a nearby f sublevel generally contain electrons.
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Ion
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An atom or group of atoms that has a positive or negative charge.
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Ionization Energy
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Energy required to remove an electron from an atom.
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Metalloids
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Has properties that are similar to those of metals and non-metals.
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Metals
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Are good conductors of heat and electric current.
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Noble Gases
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Are the elements in group 8A of the periodic table.
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Non-metals
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Are poor conducctors of heat and electric current.
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Periodic Law
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When elements are arranged in order of increasing atomic number , there is a periodic repetition of their physical and chemical properties.
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