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A1though the elements in the periodic ta...

`A1`though the elements in the periodic table are arranged according to electron structure, we make an exception for

A

neon

B

helium

C

radon

D

xenon

Text Solution

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The correct Answer is:
B
Helium `(1s^(2))`. Rather than placing it with the other `ns^(2)` configuration elements, the alkaline earth metals, it is placed with the other noble gases (of configuration `ns^(2)nsp^(6))` because of chemical similarities).
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R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test
  1. In s-block elements, the differentiating electron enters the orbital.

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  2. On the basis of chemical behavior, how many element belong to the s-bl...

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  3. A1though the elements in the periodic table are arranged according to ...

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  4. Which of the following elements is placed on its own in the table to i...

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  5. In p-block elements, theorbitals are successively filled.

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  6. The general valence shell electronic configuration of p-block elements...

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  7. How many elements belong to the p-block of the periodic table on the b...

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  8. For many years, the group 18(VIIIA) elements were called intert gases ...

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  9. p-block elements mostly fromcompounds.

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  10. Which of the groups of p-block contains the maximum number of metals?

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  11. Groups corresponding to the progressive filling of the ns and np orbit...

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  12. d-blcok elements are the elements in which the differentiating electro...

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  13. The general valence shell electronic configuration of transition eleme...

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  14. The transition metals are the elements in groups

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  15. Which of the d-block elements has zero electrons in the ns subshell?

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  16. f-block elements (sometimes called inner transition elements) are the ...

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  17. General valence shell electronic configuration of f-block elements is

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  18. In all there aref-block elements in the periodic table.

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  19. The lanthanoids and actinoids are sometimes called f-block transition ...

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  20. The chemistry of the early actinoids is more complicated than the corr...

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