Embibe Experts Solutions for Chapter: Structure of Atom, Exercise 1: WBJEE 2018

The radius of the first Bohr orbit of a hydrogen atom is $0.53\times {10}^{-8} \mathrm{cm}.$ The velocity of the electron in the first Bohr orbit is

The maximum number of electrons in an atom in which the last electron filled has the quantum numbers $\mathrm{n}=3, \mathrm{l}=2$ and $\mathrm{m}=-1$ is

The difference between orbital angular momentum of an electron in a $4\mathrm{f}$-orbital and another electron in a $4\mathrm{s}$-orbital is

Which one of the following electronic arrangements is absurd?

Which of the following electronic configuration is not possible?

The number of unpaired electrons in ${\mathrm{Ni}}^{2+}$ (atomic number $=28$ ) are