The following table shows the position of five elements A, B, C, D an the modern periodic table.
1
2
3 to 12 13
Group
Period
14
15
16
17.
18
2
A
B
C с
3
D
E
Answer the following giving reasons:
(1) Which element is a metal with valency two?
(ii) Which element is least reactive?
(111) Out of D and E which element has a smaller atomic radius?​