The ____ __ is elements arranged according to similarities in properties
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Explanation:
Families of the Periodic Table. Remember that Mendeleev arranged the periodic table so that elements with the most similar properties were placed in the same group. A group is a vertical column of the periodic table. All of the 1A elements have one valence electron.
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groups
Explanation:
in modern periodic table the groups of periodic table are groped by similarities i properties like same general electronic configuration etc,.,
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