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The elements in which electrons are prog...

The elements in which electrons are progressively filled in 4f-orbitals are calleD:

A

actinoids

B

Transition elements

C

lanthanoids

D

halogens

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The correct Answer is:
C
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NARAYNA-CLASSIFICATION OF ELEMENTS AND PERIODICITY -EXERCISE - 1 (C.W)
  1. Which of the following is not an actinoid?

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  2. The period number in the long form of the periodic table is equal to

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  3. The elements in which electrons are progressively filled in 4f-orbital...

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  4. Which of the following set of elements follows Dobereiner's law of tri...

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  5. The discovery of which of the following group of elements gave a death...

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  6. Elements which occupied position in the lother meyer curve, on the pea...

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  7. The alpha helix in a protein is classified as the

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  8. Which is incorrect statement in respect of Mendeleev's periodic table ...

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  9. (a) How do the properties of eka-aluminium element predicted by Mendel...

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  10. Consider the isoelectronic species, Na^(+),Mg^(2+),F^(-) and O^(2-). T...

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  11. Which one of the following is correct order of the size of iodine spec...

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  12. The atomic radii in case of inert gases is

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  13. Which of the following sequence of elements is arranged in the order o...

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  14. Which of the following sets contain only isoelectronic species?

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  15. The ionic species having largest size is

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  16. The first ionisation potential of Na,Mg,Al and Si are in the order

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  17. Arrange S, P and As in order of increasing ionisation energy.

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  18. The element with the highest first ionization potential is:

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  19. Which of the following represents the correct order of increasing firs...

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  20. The second electron gain enthalpies (in kJ mol^(-1)) of oxygen and sul...

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