Question

Choose the element with higher electron
affinity from each of the following pairs.
i. K and Ca ii. Si and P
iii. Se and Br iv. Be and B
(A) (i) Ca (ii) P (iii) Se and (iv) Be
(B) (i) Ca (ii) Si (ii) Se and (iv) B
(C) (i) K (ii) Si (ii) Br and (iv) B
(D) (i) K (ii) P (iii) Br and (iv) Be​

Answer 1

Explanation:

option is the correct one answer 7f6f6fi9

Answer 2

The correct option is A.

• Electron affinity is defined as the amount of energy released when an electron is added to a element.
• Among K and Ca, Ca has filled the 4s orbital so, it releases a huge amount of energy to add one electron than K. Thus K<Ca.
• Among Si and P, P has half filled 3p orbital so, it releases a huge amount of energy to add one electron than Si. Thus Si<P.
• Among Se and Br, Br has 5 electrons in a 4p orbital so, it releases a low amount of energy to add one electron to Se as it gains stability. Thus Br<Se.
• Among Be and B, Be has filled 2s orbital so, it releases a huge amount of energy to add one electron to B. Thus B<Be.

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