Question

define atomic size? and how does it vary in a group?​

Answer 1

Answer:

size of the atom is known as atomic size.

and in the group the size of the atom increases

Answer 2

The distance between, the centre of the atom and the outermost shell of the atom is called the atomic radius. the size of an atom is indicted by its radius. atomic radius is expressed in unit picometre (pm). (1 pm = 10-¹² m). the size of atom depends on number of shells, more the number of shells larger is the atomic size.

In a group, while going down a group the atomic size goes on increasing, because while going down a group never shells are successfully added. this increases the distance between the outermost electron and the nucleus. Hence, the nuclear attraction on these electrons goes on decreasing. thus in a group atomic size increases.

while going from left to right within a period, atomic radius goes on decreasing and the atomic number goes on increasing one by one. the positive charge on the nucleus increases by one unit at a time. however, the additional electron gets added to the same outermost shell. due to the increased nuclear charge the electrons are pulled towards the nucleus to a greater extent, as a result, the size of the atom decreases.