Arrange giving reason the following elements in increasing order of their atomic size : (a) Be, O, F (Given that they beiong to 2nd, 16th and 17th groups respectively and to 2nd period). (b) I, CI, F (Given that they belong to 5th, 3rd and 2nd periods respectively of 17th group). (c) Mg, N, P (Given that Mg and P belong to 2^(nd)" and "15^(th) group respectively of 3^(rd) period and N belongs to 15^(th)" group of "2^(nd) period).

Arrange giving reason the following elements in increasing order of th

1.	Arrange giving reason the following elements in increasing order of their atomic size : (a) Be, O, F (Given that they beiong to 2nd, 16th and 17th groups respectively and to 2nd period). (b) I, CI, F (Given that they belong to 5th, 3rd and 2nd periods respectively of 17th group). (c) Mg, N, P (Given that Mg and P belong to 2^(nd)" and "15^(th) group respectively of 3^(rd) period and N belongs to 15^(th)" group of "2^(nd) period).
Answer» Solution :(a) All these elements are present in the `2^(nd)` period but in different group. The increasing order of their atomic RADIUS is : `FltOltBe.` (b) These elements are present in the same group but in different periods. Since the atomic size INCREASES down the group `(2^(nd) , 3^(RD)" and "5^(th) "periods")` the increasing order of atomic radius is : `FltClltI` (c) On similar line, the increasing order of atomic radius is : `NltPltMg.` For more clarification, please consult Long Form of PERIODIC Table.