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Standard XII
Chemistry
Standard Electrode Potentials
Which has hig...
Question
Which has higher electron affinity:
Cl
or
Na
+
?
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Solution
Trend in Electron Affinity
Electron affinity is the amount of energy released when an electron is added to a neutral atom to form an anion.
The measurement of electron affinities is difficult.
Due to increasing nuclear attraction, electron affinity increases from left to right across a period.
Higher electron affinity
Cl
(Chlorine) has a higher electron affinity than
Na
+
(Sodium).
In the periodic table, chlorine has the greatest electron affinity of all the halogens.
The electron affinity rises as the atomic radius increases.
As the nuclear charge increases, so does electron affinity.
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Q.
State, whether the following statements are true or false:
(i) Fluorine has higher electron affinity than chlorine.
(ii) Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
(iii) Al
2
O
3
is an amphoteric oxide.
(iv) On moving horizontally across a period, number of valency electrons increases from one to eight.
(v) All members of zero group are non-metals.
(vi) The elements with higher electron affinity have higher ionization potential.
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