Question

13. Give reasons for the following-
(i) Valency of noble gases is zero
(ii)Cl has higher electron affinity than F
(iii)Ca2+ ion has smallest radius among Cl-,
S2+, K+ and Ca2+.​

Answer 1

Answer:

i) Valency is a combining capacity of an element. As there are no free electrons in the valence shell as well as the elements are already in a stable state , so the valency of the noble gases is zero.

ii)Cl has higher electron affinity than F. ... This means that coming electron in fluorine atom finds less attraction than in chlorine atom. Consequently, electron affinity of chlorine is higher than that of fluorine.

iii)For example, a neutral calcium atom ( Z=20 ) has 20 electrons; it loses two of them to ... The periodic table is arranged in the order of increasing proton number. ... Calcium comes the last and forms the smallest ion. ... attraction on the electron cloud P<S<Cl<K<Ca; Ionic radius P3−>S2−>Cl−>K+>Ca2+.

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Answer 2

Answer:

1...valency is a combining capacity of an element .As there are no free electron in the valence she'll as well as the element are already in stable state ,so valency of Noble gas is zero.

2...on comparing the chloride ion with fluoride ion ,we find that electron density per unit volume in fluoride ion (F-) is more than chloride (Cl-)ion. This means that coming electron in fluoride atom find less attaction than chloride atom. consequently, electron affinity of chlorine is higher that of fluorine

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