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13 Cards in this Set
- Front
- Back
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Isotope
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When an element has the same number of protons and electrons.
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Elements that are mostly non-reactive are from which group?
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18
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The most reactive metals are from which group?
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18
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Elements in a group on the periodic table share similar properties because their atoms have the same number of what in their outer energy levels.
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Valence Electrons
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The most reactive gases?
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Halogens- group 17
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The most reactive elements?
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Alkali metals- group 1
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The least reactive elements?
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Noble gases- group 18
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The least reactive elements?
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Noble gases- group 18
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The alkaline Earth metals?
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Group 2
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The least reactive elements?
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Noble gases- group 18
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The alkaline Earth metals?
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Group 2
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The transition metals?
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Groups 3-12
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Who's atomic model?
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Democritus
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