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8 May, 01:00

Why is aluminium in group 3 of the periodic table?

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Answers (2)
  1. 8 May, 01:06
    0
    Because it contains 3 valiance electrons.
  2. 8 May, 01:10
    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
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