Structure of atom practice · Mixed difficulty

If ${r_1}$ is the radius of the first orbit, the radius of ${n^{th}}$ orbit of H-atom is given by

Correct energy value order is

As the orbit number increases, the difference in two consecutive energy levels

The de-Broglie wavelength of an electron in the ground state of hydrogen atom is :

$\left({K} . {E} .=13.6 {eV} ; 1 {eV}=1.602 \times 10^{-19} {~J}\right)$

The $\mathrm{K}$ and $\mathrm{L}$ shell of an element are completely filled and there are 16 electrons in M-shell and 2 electrons in $\mathrm{N}$-shell. The atomic number of the element is

STATEMENT-1 : Half-filled and fully-filled degenerate orbitals are more stable.

STATEMENT-2 : Extra stability is due to the symmetrical distribution of electrons and exchange energy.

Maximum number of electrons which can be accommodated in a g-subshell is:

Yellow light emitted from a sodium lamp has a wavelength $(\lambda)$ of $580 \mathrm{~nm}$. Calculate the frequency (v) and wave number ( $\bar{v})$ of the yellow light.

Maximum number of electrons in a subshell is given by

Highest energy will be absorbed to eject out the electron in the
configuration.

When photon of energy $4.25 \mathrm{~eV}$ strikes the surface, the ejected electron has maximum kinetic energy $T_A$ expressed in $\mathrm{eV}$ and de Broglie wavelength $\lambda_A.$ The maximum kinetic energy of photoelectrons liberated by another metal $B$ by photons of $4.70 \mathrm{~eV}$ is $T_B$ $\left(T_B=T_A-1.5 \mathrm{~eV}\right).$ If de Broglie wavelength of the electron is $\lambda_B\left(\lambda_B=2 \lambda_A\right),$ then which is not correct?

Ions which have the same electronic configuration are those of

For a Bohr atom angular momentum M of the electron is (n=0,1,2,…)

Mass of a proton in $\mathrm{Kg}$ is

How fast is an electron moving if it has a wavelength equal to the distance it travels in one second? 

The wave function of an electron in the lowest energy state of a hydrogen atom is proportional to $e^{-r / a_0}$, where $r$ is the distance of the electron from the nucleus. Probability is maximum when electron is at

The frequency v of certain line of the Lyman series of the atomic spectrum of hydrogen satisfies the following conditions:
(i) It is the sum of the frequencies of another Lyman line and a Balmer line.
(ii) It is the sum of the frequencies of a certain line, a Lyman line, and a Paschen line.
(iii) It is the sum of the frequencies of a Lyman and a Paschen line but no Bracket line.
To what transition does v correspond?

If threshold wavelength $\left( {{\lambda ^0}} \right)$ for ejection of electron from metal is 330 nm. Then work function for the photo electric emission is

Suppose the mass of electron is decreased by $25 \%$. How will it affect the Rydberg constant?

The study of photoelectric effect is useful in understanding :

Hydrogen atoms are excited to $n = 4$ state, In the spectrum of emitted radiation, number of lines in the
UV and visible regions are resp.

Assertion: Isobars have the same atomic mass number but different atomic numbers.

Reason: Isobars have different numbers of neutrons.

The energy of an electron in the ground state $(n=1)$ for ${He}^{+}$ ion is $-x \mathrm{~J},$ then that for an electron in $n=2$ state for ${Be}^{3+}$ ion in $\mathrm{J}$ is

For the same electronic transition in the following atom or ion, the frequency of the emitted radiation will be maximum for

The maximum number of electrons possible in a sublevel is equal to

Assertion :- Bohr model is not suitable in case of multi-electron species.

Reason :- It does not tells about electron-electron interaction.

Assertion: Dalton's Atomic Theory states that atoms are indivisible and indestructible.
Reason: This statement is based on the observation that in chemical reactions, atoms are rearranged but not destroyed or created.

If the de-Broglie wavelength of a particle of mass $m$ is 100 times its velocity, then its value in terms of its mass ( ${m}$ ) and Planck's constant $(h)$ is

The number of electrons, protons and neutrons in a species are equal to 18, 16 and 16 respectively. Assign the proper symbol to the species.

Maximum number of electrons in an orbit is given by: