Question

Which element is in group 5 and period 5?

Answer 1

As you go down the picture, those are periods. So, Hydrogen (H) and Helium (He) are in Period 1.

The Group # is the # of the column. So, H, Li, Na, etc. are in Group 1.

Answer 2

its antimony with atomic mass of 122 and atomic no. of 51

Answer 3

@Jahsmin