Question

Valency of Alumini,um in aluminium dioxide

Answer 1

Thus, one atom of carbon will combine with two atoms of oxygen to form the molecule CO 2 ( carbon dioxide ). (b) From the chemical formula of the compound aluminium oxide Al 2 O 3 , the valency of aluminium can be determined. ... Hence the valency of aluminium is 3 .

Answer 2

Donating 3 electrons. ... The valency of aluminium is 3 instead of 5 because the energy required to remove 3 electrons from the outermost shell is less than the energy required to add 5 electrons.