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Why is aluminium in group 3 of the periodic table?
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Why is aluminium in group 3 of the periodic table?

User William Rosenbloom
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2 Answers

7 votes
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
User Michael Mallett
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7.7k points
3 votes
Because it contains 3 valiance electrons.
User Booberry
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8.6k points
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