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The outermost electronic configuration o...

The outermost electronic configuration of the most electronegative element is

A

`ns^(2)` np

B

`ns^(2) np^(4)`

C

`ns^(2) np^(5)`

D

`ns^(2) np^(6)`

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The correct Answer is:
C
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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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MOTION-PERIODIC TABLE -Exercise - 2 (Level-I)
  1. Which of the following does not reflect periodicity of elements ?

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  2. Pick out the isoelectronic structures from the following (i) CH(3)^(...

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  3. If there were 10 periods in the periodic table then how many elements ...

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  4. Choose the s-block element from the following:

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  5. The size of the following species increases in the order

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  6. Highest size will be of

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  7. Atomic radil of fluorine and neon in Angstrom units are respectively ...

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  8. Four elements P,Q,R & S have ground state electronic configuration as:...

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  9. Four elements P,Q,R & S have ground state electronic configuration as:...

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  10. False statement for periodic classification of element is

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  11. The correct order of second ionisation potential of C, N, O and F is:

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  12. The ionization energy will be maximum for the process.

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  13. Element in which maximum ionization energy of following electronic con...

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  14. Decreasing ionisation potential for K, Ca & Ba is

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  15. The electron affinity of the member of oxygen of the periodic table, f...

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  16. The process requiring absorption of energy is:

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

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  18. In the following which configuration of element has maximum electroneg...

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  19. Bond distance C-F in (CF(4)) & Si-F in (SiF(4)) are respective 1.33 Å...

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  20. Element Hg has two oxidation states Hg^(+) & Hg^(+2) the right order ...

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