Question

Below are some elements of modern periodic table
₄Be, ₉F, ₁₄Si, ₁₉K, ₂₀Ca
(i) Select the element which has one electron in its outermost shell
(ii) Select two elements which belong to same group
(iii) Select two elements which belong to same period
(iv) Identify the element that belong to halogen family

Answer 1

(i)- 19K(potassium) is the element having one electron in its outermost shell.

(ii) Be& Ca are of same group elements.

(iii) K&Ca are of same period elements.

(iv) F is the only element from above mentioned elements which is belongs to Halogen family.

Hope it helps uh!!