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Suneetha (A) : Third period contain 18 e...

Suneetha (A) : Third period contain 18 elements, because it has 3 subshells namely 3s, 3p and 3d. Sreelatha (B) : Third period has 8 elements, because while electrons are being filled into the shell '3d’ gets. electrons only after '4s' is filled.

A

A is correct bu B is wrong

B

A is wrong but B is correct

C

Both are correct

D

Both are wrong

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Assertion (A): ‘H' & 'He' belongs to period - 1. Reason (R) : 'H & 'He...

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

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

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

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

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  6. Valeney of Ca is

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

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

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

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

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

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  12. Actinides belongs to period.

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  13. Ionization energy is not depending on

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

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  15. Group 13(IIIA) elements are known as

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  16. The incompletely filled period is

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  17. The inner transition elements are elements.

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  18. Ionization energy increases with the Increase of

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  19. Number of essential elements are

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  20. Number of elements from natural sources known in 1940 were….

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