Question

the size of the atoms decrease while giving from left to right within a period (give reason) ​

Answer 1

Answer:

Periodic Trend

The atomic radius of atoms generally decreases from left to right across a period. ... Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge.

Answer 2

Answer:

The size of atoms decreases while moving from left to right within a period because protons are added in each period and there is increase in moving of atoms towards the nucleus.