Question

please give fast answer this question

Answer 1

1) When elements are arranged in increasing order of their masses, every eighth element repeats it's properties.

2)Na(Sodium) and Li(Lithium)

3)This is because number of energy levels, or shells increases, thus increasing the radius of the atoms

4) i) s-block

  ii) p-block

 iii) d-block

 iv) f-block

5) Elements in the same group have the same number of electrons in it's outermost shell, which leads to same valency of atoms.

Hope this helped!