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Which of the following atoms has the hig...

Which of the following atoms has the highest first ionisation energy ?

A

Rb

B

Na

C

K

D

Sc

Text Solution

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The correct Answer is:
D
Sc has the highest ionization enthslpy. This is because, it is difficult to remove an electron from 4s orbital of Sc as compared to 3s orbital of Na due to poor shielding of d-orbitals and high effective nuclear charge.
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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS (B)) (MCQs)
  1. The ionic radii of N^(3-), O^(2-) and F^(-) are respectively given by:

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  2. An element X belongs to the fourth period and the fifteenth group of t...

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  3. Which of the following atoms has the highest first ionisation energy ?

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  4. Which of the following atom should have the highest negative first ele...

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  5. The order of electronegativities among N,C, Si and P is

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  6. The group having isoelectronic species is

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  7. Which electronic configuration will show the highest first ionization ...

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  8. What is the correct increasing order of ionic atomic radii in the foll...

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  9. Which element has the highest first ionization potential ?

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  10. Which of the following statements is not correct for the periodic clas...

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  11. the element with Z=120 (not yet discovered ) will be an /a :

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  12. The first ionization enthalpy of the following elements are in the ord...

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  13. In general, the properties that decrease and increase down a group in ...

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  14. The group number, number of valence electrons, and valency of an eleme...

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  15. The IUPAC symbol for the element with atomic number 119 would be :

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  16. When the first electron gain enthalpy (triangle(eg)H) of oxygen is -14...

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  17. The size of the iso-electronic species Cl ^(-) , Ar and Ca ^(2+) is af...

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  18. In comparison to B, Be has

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  19. The element having greatest difference between its first and second io...

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  20. The isoelectronic set of ions is:

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