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The electronic configuration of an ion M...

The electronic configuration of an ion `M^(2+)` is `1s^(2)2s^(2)2p^(6)3s^(2)3d^(6)` and the atomic weight of M is 56. The number of neutrons in the nucleus of `M^(2+)` is

A

24

B

26

C

28

D

30

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-ATOMIC STRUCTURE-Objective exercise - 2B
  1. When the speed of electron increases, its specific charge

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  2. Nitride ion in Li(3)N is composed of

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  3. The electronic configuration of an ion M^(2+) is 1s^(2)2s^(2)2p^(6)3s^...

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  4. The wave length of two photons A and B are 100 Å and 100 nm. The ratio...

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  5. The kinetic energy of photo electrons depends on (A) Frequency of in...

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  6. The perimeter of two similar triangles are in 4:9 ratio, the ratio of...

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  7. (A) : In photoelectric effect, when the frequency of incident light is...

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  8. The electron in the Hydrogen atom is excited to the 5^(th) orbit, the ...

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  9. The wavelength of spectral line emitted by hydrogen atom in the Lyman ...

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  10. The longest wave length in Balmer series is

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  11. If the wave length of the first member of Balmer series of a hydrogen ...

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  12. What is the lowest energy of the spectral line emitted by the hydrogen...

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  13. (A) : Limiting line in Balmer series has a wavelength of 364.4 nm (R...

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  14. The wave number of the first line is Balmer series of hydrogen in 1520...

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  15. The electron in a hydrogen atom makes a transition from an excited sta...

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  16. In a hydrogen atom, if energy of an electron in ground state is 13.6 e...

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  17. The velocity of an electron in the fourth Bohr's orbit of hydrogen is ...

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  18. As the quantum number increases, the difference of energy between cons...

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  19. The ionization potential of H atoms is 13.6 V. The energy difference b...

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  20. If the electron falls from n = 3 to n = 2, in hydrogen atom then emitt...

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