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Calculate the number of electrons which ...

Calculate the number of electrons which will together weigh one gram.

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Mass of `1 e ^(-) = 9.1 x10 ^(-31) kg = 9.1 xx 10 ^(-28) g `
or `9.1 xx 10 ^(-28) g ` is the weight of electrons =1.
1 g is the weight of electrons `(1)/( 9.1 xx 10 ^(-28)) = 1. 099 xx 10 ^(27)`
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OMEGA PUBLICATION-STRUCTURE OF ATOM -MULTIPLE CHOICE QUESTIONS (MCQ s)
  1. Calculate the number of electrons which will together weigh one gram.

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  2. Emission of beta -particle is equivatent to:

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  3. The mass of the neutron is of the order of

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  4. The number of electrons and neutrons of an element is 18 and 20 respec...

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  5. Which of the following has longest wavelength ?

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  6. The value of Planck's constant is

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  7. Which of the following expresson gives the de-Broglie relationship ?

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  8. The total number of orbitals possible for the quantum number n is

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  9. The four quantum numbers of the valence electron of potassium are

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  10. An electron has principal quantum number 3. The number of its (i) shel...

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  11. The correct set of quantum numbers for a 4d electron is

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  12. No two electrons in an atom will have all the four quantum numbers sam...

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  13. The correct order of increasing energy of atomic orbitals is

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  14. The energy of an electron in nth orbit of hydrogen atom is

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  15. The triad of nuclei that is isotonic is

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  16. Bohr's model can explain

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  17. If the value of l = 2, what will be the value of principal quantum num...

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  18. Rutherford's experiment on scattering of alpha particles showed for th...

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  19. 3d-orbitals have

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  20. Number of unpaired electrons in the electronic configuration 1s ^(2) ,...

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  21. The two electrons in an orbital have different

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