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It is the first element in the periodic table
1 2 1
1st Element 1st group 1st period
group IA or VIIB , period 1
that is right.
s block
It is in the 1 element in the periodic table.
it's valency is 1.
1 2 1
group 1 A , period 1... left top most element ... in S block.
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