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Electron affinity of first element in wh...

Electron affinity of first element in which of the following pairs is higher?

A

`CI,F`

B

`Se,S`

C

`O,F`

D

`S,CI`

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The correct Answer is:
A
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The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. Which of the following has least electron affinity?

Order of Electron affinity of the elements or ions shown correctly?

GRB PUBLICATION-PERIODIC TABLE-D. Electron Gain Enthalpy (Electron Affinity)
  1. Select the equation is endothermic in nature?

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  2. Which one of the following statements is correct?

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  3. Electron affinity of first element in which of the following pairs is ...

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  4. The least stable in amongst the following is :

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  5. In which of the following arrangements the order is NOT according to t...

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  6. Electron gain enthalpy is positive when:

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  7. Following are the values of the electron gain enthalpy (in kJ mol^(-1)...

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  8. Electron addition would be easier in:

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  9. The electron affinities of N,O,S and CI are such that:

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  10. Consider the following statements. Statement-1: Fluorine does not fo...

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  11. In which of the following process, maximum amount of energy involved?

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  12. The increasing order of electron affinity is

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  13. Which of the following has least first electron affinity ?

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  14. Which of the following processes is endoergic in nature?

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  15. Which of the following is not the correct arrangement according to the...

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  16. Electronic configuration of four elements p,q,r and s are given below ...

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  17. Among halogens, the correct order of amount of energy released in elec...

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  18. The first ionisation potential of Na is 5.1eV. The value of eectrons g...

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  19. The incorrect statement is :

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  20. Which of the following atom has towest negative electron gain enthalpy...

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