Two elements X and Y belong to group 1 and 2 respectively. in the same period compare them with respect as - a) The number of valence electrons. b) valency c) metallic characters. d) size of the atoms. e) formulae of their oxides and chlorides.

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Solution for first two queries,

1. The group 1 elements are called as alkali metals while group 2 elements are called as alkaline earth metals.
2. Valency:  The alkali metals can have +1 oxidation state while the alkaline earth metals can have +2 oxidation state.
3. The number of valence electrons in alkali metals is 1 while the number of valence electrons in alkaline earth metals are 2.

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