Structure of atom practice · Mixed difficulty

The de Broglie's wavelength of electron present in first Bohr orbit of $\mathrm{H}$ atom is

Determine the wavelength of a photon of electromagnetic radiation having energy $2.99 \times 10^{12} \mathrm{~erg} \mathrm{~mol}^{-1} \left(\mathrm{h}=6.625 \times 10^{-34} \mathrm{~Js}\right)$.

If a species has 16 protons, 18 electrons and 16 neutrons. Find the species and its charge

The magnetic quantum number for valency electron of sodium is:

The time period of revolution of electron in $\mathrm{H}$-atom is directly proportional to

If the magnitude of uncertainties in position $(\Delta {x})$ and momentum $(\Delta {p})$ are equal then which of the following relation is correct?

For sets of values of quantum numbers $(\mathrm{n}, 1, \mathrm{~m}$ and $\mathrm{s})$ are given below. Which of these does not provide a permissible solution of the wave equation?

State the number of protons, neutrons and electrons in $\mathrm{C}^{14}$.

What is the potential energy of electron in 3
orbit of H-atom ?

Radial nodes present in $3 \mathrm{s}$ and $2 \mathrm{p}$-orbitals are respectively

In H-atom, if ‘x’ is the radius of the first orbit, de-Broglie wavelength of an electron in 3rd orbit is

The energy difference will be minimum for which of the following energy levels of $\mathrm{H}$-atom?

The value of charge on the oil droplets experimentally observed were $- 1.6 \times {10^{ - 19}}$ and $- 4 \times {10^{ - 19}}$ coulomb. The value of the electronic charge, indicated by these results is:

Statement (S): The magnetic moment of $\mathrm{Mg}$-atom is more than $\mathrm{K}$-atom as the former has two electrons in outermost shell.

Explanation (E): The magnetic moment of $\mathrm{N}$-atom is more than magnetic moment of $\mathrm{O}$-atom and former has more number of unpaired electrons.

If the speed of the electron in the first Bohr orbit of hydrogen atom be ' $x$ ' then the speed of electron in the third Bohr orbit is

Which of the following set of quantum numbers is impossible for an electron in an atom?

According to Bohr’s theory, the angular momentum of an electron in 5th orbit is

When atomic orbitals are filled according to the Aufbau principle. The $6 \mathrm{p}$ orbitals are filled immediately after the:

Which of the following electron transition in hydrogen atom will require largest amount of energy?

The representation of the ground state electronic configuration of He by box-diagram as is wrong because it violates

Photons having energy equivalent to binding energy of $4^{\text {th }}$ state of $\mathrm{He}^{+}$ion is used on the metal surface of work function $1.4 \mathrm{eV}$. If electrons are further accelerated through
the potential difference of $4 \mathrm{~V}$ then the minimum value of de-Broglie wavelength associated with the electron is

The wavelength (in cm) of second line in the Lyman series of hydrogen atomic spectrum is