JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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The energy of an electron in Bohr's orbit of hydrogen atom is

-13.6 \mathrm{~eV}

. The total electronic energy of a hypothetical

\mathrm{He}

atom in which there are no electron-electron repulsions or interactions is

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Correct option: C

-108.8 \mathrm{~eV}

Option C (

-108.8 \mathrm{~eV}

) is correct because the total electronic energy is calculated by multiplying the energy of one electron by the square of the atomic number and the number of electrons.

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Which of the following is paramagnetic? The time taken by the electron in one complete revolution in the

n^{\text {th }}

Bohr's orbit of the hydrogen atom is The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '

\mathrm{A}

\times 10^{12}

hertz and that has a radiant intensity in that direction of

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

watt per steradian. 'A' and 'B' are respectively Quantum number which defines the orientation of orbital present in a subshell is Maximum number of electrons associated with

\ell = 1,\,\,m = 0

in magnesium atom is The nucleus and an atom can be assumed to be spherical. The radius of the nucleus of mass no. A is given by

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.

. The atomic radius of atom is 1 Å. If the mass no. is 64, the fraction of the atomic volume that is occupied by nucleus is: