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Question

In the activity series of metals — M is a metal above hydrogen in the activity series and it’s oxide has the formula M2O. M2O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following :
(i) What kind of combination exists between M and O?
(ii) State the number of electrons in the outermost shell of M ?
(iii) Name the group to which M belongs.

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Answer

Given, M is a metal

(i) Electrovalent bond exits between M and O because the bond is formed between a metal and non-metal due to oppositely charged ions.

(ii) Number of electrons in the outer most shell of M is 1. It is so because the valency of O is -2 and as 2 atoms of M combine with O to form M2O, hence we can say that M has 1 valence electron.

(iii) M belongs to group 1 [1A] because there is 1 electron in the outer most shell.

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