Question

How does atonic size rory in the group
and across a period ? Explain
suitable example​

Answer 1

Atomic size is the distance between the center of nucleus and the outermost electron in the outer shell. Across a period from left to right there is decrease in atomic size with increase in nuclear charge of the element. Atomic size increases down the group because of addition of extra shell.

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: ... 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.