Nadia009876 Nadia009876

05-04-2017
Chemistry

contestada

Why is aluminium in group 3 of the periodic table?

Respuesta :

tadhyatt tadhyatt

05-04-2017

Because it contains 3 valiance electrons.

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annastasia annastasia

05-04-2017

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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