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Assertion (A): ‘H' & 'He' belongs to per...

Assertion (A): ‘H' & 'He' belongs to period - 1. Reason (R) : 'H & 'He' contain only one main shell 'K'.

A

Both 'A' and 'R' are correct and 'R' is correct explanation of 'A'

B

Both A and B are correct but R is not correct explanation of A

C

A' is correct but 'R' is wrong

D

A' is wrong but 'R' is correct

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. The pair of elements that have similar chemical properties are

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  2. Pavan (P) : The general electronic configuration of alkali metal famil...

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  3. Assertion (A): ‘H' & 'He' belongs to period - 1. Reason (R) : 'H & 'He...

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  4. Assertion (A): The first period in periodic table contain only two ele...

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  5. Suneetha (A) : Third period contain 18 elements, because it has 3 subs...

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  6. James (A) : The positive ions of an element has less in size than its ...

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  7. Balu (B) : Valence of an element with  respect to hydrogen is the numb...

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  8. Valeney of Ca is

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  9. Assertion (A) : Atomic radii increase from top to bottom in a group of...

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  10. Assertion (A): Atomic radii of elements decrease across a period from ...

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  11. Assertion (A) : The size of Na^+ ion is less than 'Na' atom. Reason (R...

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  12. It is easier to remove one electron from O than N because Nitrogen has

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  13. Which of the following property decreases down a group :

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  14. Actinides belongs to period.

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  15. Ionization energy is not depending on

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  16. Moseley calculated the number of positive charges in the atoms by anal...

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  17. Group 13(IIIA) elements are known as

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  18. The incompletely filled period is

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  19. The inner transition elements are elements.

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  20. Ionization energy increases with the Increase of

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