JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Easy

1 of 1

Application +4 | -1

An atom has the electronic configuration of

1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^{10}, 4 s^2 4 p^5

. Its atomic mass is 80 . Its atomic number and the number of neutrons in its nucleus shall be:

View answer and explanation

Correct option: A

35 and 45

Option A (35 and 45) is correct because the electronic configuration indicates 35 electrons, which is the atomic number, and the difference between the atomic mass (80) and atomic number (35) gives the number of neutrons (45).

More Questions from STRUCTURE OF ATOM

Practice All Chapter MCQs →

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: