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The outermost electronic configuration o...

The outermost electronic configuration of the most electronegative element is

A

`ns^2 np^3`

B

`ns^2 np^4`

C

`ns^2 np^5`

D

`ns^2 np^6`

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The correct Answer is:
C
Most electronegative element in the periodic table are halogens with general electronic configuration of `ns^2 np^5`
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The properties of the elements (atomic/ionic radii, electron gain enthalpy, ionization enthalpy, electronegativity, valence, oxidising/reducing power, acid/base character, etc.) which are directly or indirectly related to their electronic configirations are called periodic properties. These properties show a regular gradation on moving from left to right in a period or form top to bottom in a group. Down a group, the atomic/ionic radii, metallic character and reducing character increase while ionization enthalpy and electronegativity decrease. Along a period from left to right, atomic/ionic and metallic character decrease while ionization enthaloy, electronegativity, non-metallic character and oxiding power increase. However, electron gain enthalpy becomes less negative down a group butmore negative along a period. In contrast, inert gases have positive electron gain enthalpies which do not show may regular trend. The outermost electronic configuration of the most electronegative elements is:

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DINESH PUBLICATION-THE HALOGEN FAMILY-Selected Straight Objective Type MCQs
  1. Hydrogen bonding is strongest in

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  2. Bromine can be liberated form potassium bromide solution by the action...

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  3. The outermost electronic configuration of the most electronegative ele...

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  4. The correct increasing order of bond dissociation energy for N2, O2, F...

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  5. Concentrated HNO(3) reacts with iodine to give:

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  6. Which of the following is the strongest acid?

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  7. The elements which exists in the liquid state is/ are

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  8. Increasing order of ionic size : N^(3-),Na^(+),F^(-),O^(2-),Mg^(2+)

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  9. The halogen which is most easily reduced is

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  10. The type of hybrid orbitals used by chlorine atom in ClO(2)^(-) is :

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  11. Arrange the acids (I) H2SO3, (II) H3PO3 and (III) HClO3 in the decreas...

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  12. The following acid have arrange in the order of decreasing strength. I...

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  13. KF combines with to form KHF2. The compound contains the species :

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  14. Which one of the following are pseudohalide ions ?

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  15. The correct order of acidic strength is

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  16. The set with the correct order of acidity is

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  17. The reaction 3ClO^(-)(aq)rarrClO(3)^(-)(aq)+2Cl^(-)(aq) an example of ...

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  18. Which species has the maximum number of lone pair of electrons on the ...

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  19. In which of the following molecules /ions , are all the bonds not equa...

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  20. What products are expected from the desproprtionation reactin of hypoc...

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