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Which of the following statements is not...

Which of the following statements is not correct ?

A

Third period in the periodic table can have a maximum of eighteen elements.

B

Some compounds of the noble gas xenon are known.

C

Group I elements are called alkali metals.

D

The last member of the halogen family is Astatine.

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BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. The electronic configuration of the first artifical element………

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  2. What type of oxide would Eka-aluminium form ?

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  3. Which of the following statements is not correct ?

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  4. Point out the correct statement

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  5. Which is not the characteristic of a period ?

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  6. Which defect of Mandeleeff's periodic table is automatically overcome ...

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  7. Which of the following indicates the correct order of variation in ato...

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  8. Choose the correct answer for the following matching :

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  9. Elements belonging to the same period have

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  10. The scientist who made maximum contribution towards periodic table was

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  11. Which of the following sets of atomic numbers corresponds to the atomi...

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  12. Atomic numbers of last elements of 'd' block and p block of incomplete...

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  13. The outermost shell of a representative element contains x electrons a...

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  14. Which of the following statements about the modern periodic table are ...

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  15. Choose the right properties of periodic table. (a) Atomic radius incr...

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  16. Which of the following species does have electrons equal to 18 ? (a) K...

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  17. Pick out the correct statements about chlorine atom. (a) Chlroine is ...

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  18. What are the elements that belonged to 18th (or) '0' group ? (a) Heliu...

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  19. Electronic configuration from ns^2 np^1 to np^2 np^6 are called

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  20. 1 pm = …………..

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