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24 July, 15:10

Why is aluminium in group 3 of the periodic table?

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Answers (2)
  1. 24 July, 16:11
    0
    Aluminum has an atomic number 13

    electronic configuration = 2,8,3

    we know

    period number signifies the number of orbits in an atom.

    aluminum has 3 orbits

    therefore AL is in period 3
  2. 24 July, 18:36
    0
    Because it contains 3 valiance electrons.
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