Question

how the atomic size vary in a group and across a period explain with suitable example ​

Answer 1

Answer:

coming down the group from top atomic size increases as number of orbitals increases

eg:-atomic size order

iodine greater than bromine

bromine greater than chlorine

chlorine greater than fluorine

Answer 2

Answer:

when you move across a period from left to right the size of the atom reduces.

where as when you move from up to down in a group the size of the atom increases.

Explanation:

whenwhen you move in a period from left to right then the number of electrons increases and the number of protons remains constant hence the net attracting force between electrons and protons increases.

whereas when you move from up to down in a group the number of cells increases at regular interval hence the the hence the atom becomes bigger.