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Which of the following atoms ha the high...

Which of the following atoms ha the highest first ionisation energy-

A

Rb

B

Na

C

K

D

Sc

Text Solution

Verified by Experts

The correct Answer is:
D
Alkali metals of group-1 can remove 1 electron to achieve the stable noble gas configuration. Hence they have comparatively low ioinisation. Hence they have comparatively low ionisation energy. However `Sc([Ar]d^(1)4s^(2))` cannot achieve such stabilisation by removing only 1 electron. therefore it has higher ionisation energy.
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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-ENTRANCE QUESTION BANK
  1. Which one has the highest boiling point-

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  2. Ionic radii (Å) of N^(3-),O^(2-) and F^(-) are -

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  3. Which of the following atoms ha the highest first ionisation energy-

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  4. The group having isoelectronic species is-

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  5. Both lithium and magnesium displace several similar propertiess due to...

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  6. What is the value of electron-gain enthalpy of Na^(+) if IE(1) of Na=5...

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  7. In which of the following arrangements, given sequence is not accordin...

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  8. Identify the wrong statement among the following-

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  9. Reason of lanthanoid contraction is-

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  10. Be^(2+) is isoelectronic with which of the following ions?

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  11. Which of the following orders of ionic radii is correctly represented ...

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  12. The species Ar, K^(+) and Ca^(2+) contain the same number of electrons...

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  13. Because of lanthanide contraction, which of the following pairs of ele...

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  14. In which of the following options the order of arrangement does not ag...

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  15. The element Z=114 has been discovered recently. It will belong to whic...

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  16. Among CaH(2),BeH(2),BaH(2), the order of ionic character is-

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  17. Which of the following is most acidic?

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  18. The first ionisation enthalpy of Na, Mg and Si are 496, 737, 776 kJ*mo...

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  19. Which is correct regarding size of atom-

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  20. An element (X) belongs to fourthh period and fifteenth group of the pe...

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