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Answer:AlO₂ is the formula of aluminate. => -1 is the combining capacity or valency of aluminate. Here Al is bonded with two O atoms; one of the O is bonded with double bond and another is bonded with single bond hence the valency of Al in aluminate ion will be 3 here as it is bonded with three bonds.

Formula and Valency of chromate. Chromate is an ion which is present in the chromium salt. When the element chromium has an oxidation state as 6+, it produces chromate ions as oxoanions. ... In the case of chromate ion, it bonds by gaining 2 electron, thus its valency is 2-.

Atomic number of aluminium is 13 so its electronic configuration is 2, 8, 3. Since it has 3 electrons in its valence shell, it will lose 3 electrons to complete its octet hence its valency is +3.

Copper is one of the transition elements and thus exhibits variable oxidation states. It has two valencies: +1 and +2 and the corresponding atoms are termed as Cuperous (+1 valency) and Cupric (+2 valency). These are also denoted as Cu(I) and Cu(II).

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