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One element has atomic weight 39. Its el...

One element has atomic weight 39. Its electronic configuration is `1s^(2), 2s^(2) 2p^(6),3s^(2) 3p^(6) 4s^(1)`. The true statement for that element is:

A

Hight value of IE

B

Transition element

C

Isotone with `""_(18)Ar^(38)`

D

None

Text Solution

Verified by Experts

The correct Answer is:
C
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ALLEN-QUANTUM NUMBER & PERIODIC TABLE-J-ADVANCED EXERCISE
  1. Moving from right to left in a periodic table, the atomic size is :

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  2. The increasing order of electronegativity in the following elements :

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  3. One element has atomic weight 39. Its electronic configuration is 1s^(...

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  4. The number of paired electrons in oxygen atom is :

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  5. The decreasing size of K^(+),Ca^(2+),Cl^(-) & S^(2-) follows the order...

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  6. Which of the following has the maximum number of unpaired electrons ?

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  7. The incorrect statement Among the following is A)The first ionisation...

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  8. Li^(+),Mg^(2+),K^(+),Al^(3+) (Arrange in increasing order of radii)

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  9. Which one of the following statement (s) is (are) correct?

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  10. The electrons identified by the following quantum numbers n and l: (i)...

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  11. Gaseous state electronic configuration of ntrogen atom can be represen...

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  12. The electronic configuration of an element is 1s^(2), 2s^(2), 2p^(6), ...

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  13. Statement-1 : F arom has a less negative electron gain enthalpy than C...

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  14. The correct order of radii is :

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  15. The IE of Be is greater than that of B.

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  16. The set representing correct order of IP(1) is

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  17. The least stable in amongst the following is :

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  18. The maximum number of electrons that can have principal quantum number...

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  19. In an atom, the total number of electrons having quantum numbers n =...

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  20. The increasing order of atomic radii of the following group 13 element...

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