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ICSE Class 10 Answered

Atomic size increases down the group but in the topper mock test they have given its false!

Asked by Gerald Lobo | 09 Mar, 2014, 11:02: AM
answered-by-expert Expert Answer

Remember!! Atomic size increases down the group and decreases across the period.

In moving from left to right across a period the size decreases because of increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size the atom and when we move down the group the atomic size increases  because the new shell is added as we go down the group this increases the distance between the outermost  electrons and the nucleus so that the atomic size increases in spite of the nuclear charge.

Answered by | 09 Mar, 2014, 01:10: PM

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