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Which of the following gaseous atoms has...

Which of the following gaseous atoms has the highest value of ionisation enthalpy?

A

`P`

B

`Si`

C

`Mg`

D

`Al`

Text Solution

Verified by Experts

The correct Answer is:
A
Phosphorus has stable half-filled valence shell electronic configuration, `3s^(2)3p^(3)`. Even `Mg` has fully filled configuration `3s^(2)` , but `P` has greater nuclear charge also.
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A2Z-CLASSIFICATION OF ELEMENTS AND PERIODICITY OF PROPERTIES-Atomic Radius, Screening Effect And Penetration Effect
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  2. which one of the following species possesses maximum size?

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  3. which of the following ions is the smallest in size?

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

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  5. Which of the following is correct order of atomic radii?

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  6. The ratio between radii of He^(+) ion and H atom is

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  7. Which of the following is the largest ion?

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  8. Which one is the correct order of the size of the iodine species?

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

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  10. Which of the following has the smallest size?

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  11. The trivalent ion having size in lanthanide series is

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  12. The correct order of atomic radii is:

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  13. Correct energy value order is

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  14. The correct order of atomic radii is

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  15. The smallest among the following ions is

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  16. The radius of La^(+) (at no 57) is 1.06Å. What may be the radius of Lu...

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  17. Which of the following gaseous atoms has the highest value of ionisati...

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  18. The correct order of ionisation energy for comparing corbon, nitrogen ...

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  19. The second ionisation enthalpies of elements are always higher than th...

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  20. The first ionisation potential is maximum for

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