Question

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Answer 1

Heya !!!


here is your answer!!!



1) in the first group there is Alkali earth metals are present


so, Metals like


H



Li




Na



K



Rb




Cs



Fr



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2) electonic configuration of first 3 element is



H =>. 1


Li ==> 2 ,1


Na ===> 2 ,8 ,1



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3 ) we find similarity that. they have 1 valance electron in last shell .


so their valency is 1





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4 ) there is 1 valance electron present in each shell Because

on moving down to preodic table. valency remains same !!


hence ,


there is 1 valance electron present in these elements !!!



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hope it helps you dear a lot !!!




thanks !!!



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