Element A is a member of group VI. It forms an ionic salt with calcium with the formula CaA. It forms a covalent compound with chlorine with the formula ACl2. It forms two molecular oxides with formulae AO2 and AO3.

Explain which elements of group VI would have the properties exhibited by element A.

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The elements of group VI are Oxygen, Sulphur, Selenium, Tellurium and Polonium.

The last member is a distinct metal. Out of S, Se and Te - all of them exhibit the properties exhibited by compound A.

For example, form ionic salts with `Ca^(2+)` , of the formula CaS, CaSe and CaTe.

Form covalent chlorides of the formula SCl2, SeCl2 and TeCl2.

Forms two oxides of the formula:

SO2 and SO3

SeO2 and SeO3

TeO2 and TeO3

(S and Te forms lesser known unstable monoxides, though).

Therefore, A may be any element out of these three.

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