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CBSE Class 10 Answered

Explain giving justification the trends in the following properties of elements, on moving from left to right in a period, in the Modern periodic Table. (a) Variation of valency. (b) Change of atomic radius. (c) Metallic to non-metallic character. (d) Electronegative character. (e) Nature of oxides.
Asked by sajal2402 | 28 Feb, 2019, 11:29: AM
answered-by-expert Expert Answer
Properties of elements, on moving from left to right in a period, in the Modern Periodic Table:
 
(a) Variation in valency:
     Valency of elements with respect to hydrogen increases arithmetically from 1 to 4 and back to 1.
 
(b) Atomic radius:
     The atomic radius decreases on moving from left to right in a period.
 
(c) Metallic and Non-metallic Properties:
     As the effective nuclear charge increases across the period, the tendency to lose the electrons will decrease.
     So, the metallic character decreases across the period.
 
(d) Nature of oxides:
     Oxides of elements in a period become progressively less basic and finally change to the acidic character.
Answered by Varsha | 28 Feb, 2019, 12:31: PM

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