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Configuration that shows the highest ene...

Configuration that shows the highest energy released when an electron is added to the atom

A

`1s^2 2s^2 2p^3`

B

`1s^2 2s^2 2p^4`

C

`1s^2 2s^2 2p^5`

D

`1s^2 2s^2 2p^6`

Text Solution

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The correct Answer is:
C
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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 or first electron affinity or electron gain enthalpy. The first electron 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^(-1) 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 effect (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increases as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configurations. 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 processes is endoergic in nature ?

The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity or first electron affinity or electron gain enthalpy. The first electron 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^(-1) 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 effect (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increases as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configurations. 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 species has the highest electron affinity?

The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity or first electron affinity or electron gain enthalpy. The first electron 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^(-1) 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 effect (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increases as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configurations. 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 one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

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AAKASH SERIES-PERIODIC PROPERTIES-LEVEL -I (EAMCET) EXERCISE -III
  1. Electron affinity is

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  2. The property of an element that is not normals determined directly but...

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  3. Electron affinity is measured in

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  4. Which of the following is an endothermic process?

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  5. In a period from left to right, electron affinity

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  6. Configuration that shows the highest energy released when an electron ...

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  7. Electron affinity of Fluorine is less than that of Chlorine because

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  8. Among chalcogens electron affinity is highest for

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  9. The element with highest electron affinity is

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  10. Incorrect statement is

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  11. Pauling's electronegativity is based on

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  12. Pauling's electronegativity values for elements are useful in predicti...

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  13. Correct relation among XA, XB, and Delta, where XA, and XB are the ele...

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  14. Reference element for Pauling's electronegativity is

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  15. Electronegativity of an element is the average of its ionisation energ...

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  16. The electronegativity values according to Mulliken scale are times t...

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  17. Electronegativity on Mulliken scale is limited to

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  18. If I and E are ionisation energy and electron affinity of an element i...

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  19. In a period electronegativity is highest for

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  20. The values that are useful in writing chemical formulae and in calcula...

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