Answers

2015-11-03T06:40:39+05:30
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
2015-11-04T19:38:08+05:30
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.