1.

Elements A, B, C and D have atomic numbers 1, 8, 11 and 19 respectively. Choose the odd element and give reasons for your answer.

Answer»

Solution :ELEMENT B is ODD element.
Elements A, C and D belong to Group 1 because they have 1 ELECTRON in the outermost SHELL. Element B does not belong to this group as this has 6 electrons in the valence shell.


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