 Group (periodic table) (source code)

by Codex (@codex,  0)

= Group
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= Periodic group
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= Periodic table group
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A <periodic group> is a vertical column of the <periodic table>. For example, <fluorine> and <chlorine> are in <periodic group> 17, with seven <valence electrons> in each neutral <ground state> <chemical atom>. A shared outer <electron configuration> supports similarities in <chemical reactions>, rather than equality of every property.

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