Question

4. The electronic configuration of an element 'x' is 2.8.8, 1.
To which (a) period and b group of the moderm periodic
table does x belong? State its valency. Justify your
answer in each care.​

Answer 1

Answer:

The atomic number of the given element is 19.

This the element is potassium

a) It belongs to 4th period

b) It belongs to 1st group

It's valency is 1

HOPE THIS HELPS

Answer 2

Answer: The element X has it's atomic number 19. So, the element is Potassium (K). It belongs to group 1 and period 4 in the modern periodic table. Potassium only has one electron in its outermost shell since it is less than 4 the valency of Potassium is equal to 1.