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The first four ionization energies of an...

The first four ionization energies of an element are `191, 578, 872`, and `5962 "kca"l`. The number of valence electrons in the element is.

A

1

B

2

C

3

D

4

Text Solution

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The correct Answer is:
C
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FIITJEE-ATOMIC STRUCTURE-ASSIGNMENT PROBLEMS (OBJECTIVE) LEVEL-I
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  2. The maximum number of electrons in a sub shell having the same values ...

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  3. The first four ionization energies of an element are 191, 578, 872, an...

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  4. An electron with velocity v is found to have a certain value of de Bro...

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  6. Given that in H-atom the transitioin energy for n=1 to n=2 is 10.2eV,...

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  7. What is the wavelength of the radiation emitted producing a line in th...

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  8. For silver metal, the threshold frequency v(0) is 1.13x10^(17)Hz. What...

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  9. The energy of the electron in the hydrogen atom is given by the expres...

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  10. The nucleus of an atom can be asssumed to be spherical. The radius of ...

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  11. In Bohr's model of the hydrogen atom the ratio between the period of r...

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  12. An electron in an isolataed atom, may be described by four quantum num...

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  13. Number of nodal planes for f-orbital are

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  14. The wavelength of a vertain line in Balmer series is observed to be 43...

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  16. A possible set of quantum numbers for the last electron added to a gal...

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  17. If wavelength is equal to the distance travelled by the electron in on...

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  18. The distance between 3rd and 2nd orbit of hydrogen atom is

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  19. An atom has four unpaired electrons. The total spin of this atom will ...

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  20. Which of the following ion has the maximum magnetic moment?

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