JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Medium

1 of 1

Understanding +4 | -1

The electronic configuration of

\mathrm{Pt}

(atomic number

78)

is:

View answer and explanation

Correct option: A

[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^9 6 \mathrm{~s}^1

Option A ([Xe] 4f14 5d9 6s1) is correct because Platinum (Pt) has an atomic number of 78, and its electronic configuration follows Hund's rule and the Aufbau principle, with one electron promoted from the 5d to the 6s orbital for stability.

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: