Question

Arrange increasing order of atomic radius of given elements.
(i) O, N, F, B, Be, Li, C (ii) P, S, Mg, Na, Al, Si, Cl
(ii) K, Na, Li, Cs, Rb
(iv) CI, F, I, At, Br​

Answer 1

Knowledge required :

◆ On moving from left to right accross a period , the atomic radius decreases

◆ On moving From top to bottom in a group , the atomic radius increases.

Required Answer :

(i) O , N , F , B , Be , Li , C

The given elements are ftom 1st period . The increasing order of atomic radius of the gievn elements is ,

F < O < N < C < B < Be < Li

(ii) P , S , Mg , Na , Al , Si , Cl

The given elements are from 2nd period . The increasing order of atomic radius of the gievn elements is ,

Cl < S < P < Si < Al < Mg < Na

(iii) K , Na , Li , Cs , Rb

The given elements are from IA group . The increasing order of atomic radius of the gievn elements is ,

Li < Na < K < Rb < Cs

(iv) Cl , F , I , At , Br

The given elements are from VIIA group . The increasing order of atomic radius of given elements is ,

F < Cl < Br < I < At

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Answer 2

Answer:

Knowledge required :

◆ On moving from left to right accross a period , the atomic radius decreases

◆ On moving From top to bottom in a group , the atomic radius increases. \begin{gathered}\\\end{gathered}

Required Answer :

(i) O , N , F , B , Be , Li , C

The given elements are ftom 1st period . The increasing order of atomic radius of the gievn elements is ,

F < O < N < C < B < Be < Li

(ii) P , S , Mg , Na , Al , Si , Cl

The given elements are from 2nd period . The increasing order of atomic radius of the gievn elements is ,

Cl < S < P < Si < Al < Mg < Na

(iii) K , Na , Li , Cs , Rb

The given elements are from IA group . The increasing order of atomic radius of the gievn elements is ,

Li < Na < K < Rb < Cs

(iv) Cl , F , I , At , Br

The given elements are from VIIA group . The increasing order of atomic radius of given elements is ,

F < Cl < Br < I < At

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