Question

What type of oxide would Eka– aluminium form?(a) EO3(b) E3 O2(c) E2 O3(d) EONCERT Class XScience - Exemplar ProblemsChapter_Periodic Classification of Elements

Answer 1

c) E2O3
________
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Answer 2

Answer:(c) E2 O3

Explanation: Eka Aluminium is the element after aluminium and is named as gallium. As they both belong to same group the valency of gallium will be same as aluminium and will be 3.

$Ga:31:[Ar]3d^104s^24p^1$

It can lose three electrons to attain nearest noble gas configuration.Thus valency is 3.

To form a neutral oxide with $O^{2-}$ , eka aluminium must form a compound $E_2O_3$.