Question

Atom of element a,b,c and ,d have 3,11,17 and 20 protons in their nuclii.Identify element belong to the group and element belong to same period

Answer 1

Answer:

Explanation:3 proton that mean lithiyum period -2,group -2

Answer 2

Answer:

Here,

Atomic number=No. of protons in the nucleus.

So,Atomic no. of a,b,c and d are 3,11,17 and 20 respectively.

From their electronic configuration ,the elements with atomic no. 3 and 11 belong to the same group I.e.Group1 and the elements with atomic no. 11 &17 belong to same period.