Define atomic size how does it vary from period and Groups

1.	Define atomic size how does it vary from period and Groups
Answer» size decreases across a Period from left to right as we face the Table, but INCREASES down aGroup, a column of the Periodic Table.Atomic RADIUS of the elements generally decreases from left to the right in a period because on moving from left to right in aperiod the nuclear charge gradually increases by one unit & one electron is ALSO added in the electron shell.Due to this the electrons get ATTRACTED more & more towards the nucleus.consequently the atomic RADII decreases .Atomic radius of the elements increases as we move downwords in a group because on moving down a group there is an increase in principal quantum number & THUS, increase in the number of electrons shells.Therefore the atomic size is expected to increase.

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Define atomic size how does it vary from period and Groups

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