Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following question.

Which two of these elements could definitely be metals.

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Solution

They belong to 3rd period and groups 1, 2, and 13 - 18 respectively i.e.(A in grp. 1, B in 2, C in 13, D in 14..... H in 18)

A and B elements will definitely be metals as their oxides are basic in nature and metals form basic oxides.

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They belong to 3rd period and groups 1, 2, and 13 - 18 respectively i.e.(A in grp. 1, B in 2, C in 13, D in 14..... H in 18)A and B elements will definitely be metals as their oxides are basic in nature and metals form basic oxides.

They belong to 3rd period and groups 1, 2, and 13 - 18 respectively i.e.(A in grp. 1, B in 2, C in 13, D in 14..... H in 18)

A and B elements will definitely be metals as their oxides are basic in nature and metals form basic oxides.