Structure of atom practice · Mixed difficulty

The momentum of a photon of wavelength 6626 $\mathrm{nm}$ will be

The electronic configuration of an element is $1{s^2},2{s^2}\,2{p^6},3{s^2}\,3{p^6}\,3{d^5},4{s^1}.\,$ This represent its:

The number of electrons accommodated in an orbit with principle quantum number 2, is

For which of the following, the radius will be same as for hydrogen atom having n=1?

Which has the maximum value of magnetic moment?

An isostere is

Zeeman effect explains splitting of lines in

An electron that has quantum number n=3 and m=2:

Bohr radius for the hydrogen atom (n = 1) is approximately $0.53\,\,\mathop \mathrm{A}\limits^\mathrm{o} .$ The radius for the first excited state ( n = 2) orbit is (in $\mathop \mathrm{A}\limits^\mathrm{o} )$

Degeneracy of s, p, d, f and g sub-orbits respectively are

In the Bohr’s orbit, what is the ratio of kinetic energy and total energy of the electron ?

The de-Broglie equation applies

The energy of an electron in Bohr's orbit of hydrogen atom is $-13.6 \mathrm{~eV}$. The total electronic energy of a hypothetical $\mathrm{He}$ atom in which there are no electron-electron repulsions or interactions is

Energy for $7.25 \times 10^{15}$ photons of $5.37 \times 10^{14} \mathrm{~s}^{-1}$ frequency in Einstein unit is

Which wave property is directly proportional to energy of electromagnetic radiation:

The ratio of specific charge of a neutron and an $\alpha$-particle is

Number of nodal planes in 4P – subshell will be

The first line in the Balmer series in the $\mathrm{H}$-atom will have the frequency

When an electron moves from higher orbit to a lower orbit … is produced

Which one of the following orbitals is spherical in shape

There are three elements A, B, C having outermost electronic configuration $3 s^2, 3 p^4, 3 p^5$ respectively. Which statement is incorrect for three elements:

Angular momentum of an electron in an orbital is given by

What are the total numbers of orbitals and electrons for $m = 0$, in the ground state of $Zn$ (atomic number = 30).

Consider the following statements:

I. The energy of electrons in atoms is quantised.

II. The existence of quantised electronic energy levels is a direct result of the wave like properties of electrons.

III. The path of an electron in an atom can never be determined accurately.

The correct statements are

The quantum numbers of most energetic electron in Ne atom when it is in first excited state is:

The electronic configurations of four elements L,P,Q and R are given below, $L = 1{s^2},2{s^2}2{p^4}\;\;\;Q = 1{s^2},2{s^2}2{p^6},3{s^2}3{p^5}$ , $P = 1{s^2},2{s^2}2{p^6},3{s^1}\;\;\;R = 1{s^2},2{s^2}2{p^6},3{s^2}$ , The formula of the ionic compounds that can be formed between these elements are:

The frequency of revolution of electron II excited state $\text{He}^+$ and I excited state of $\text{H}$-atom:

The energies of the electron in a hydrogen like ion are given by :
$E_n=-\left(2.18 \times 10^{-18}\right) Z^2\left(\frac{1}{n^2}\right)$, where $n$ is principal quantum number and $Z$ is the atomic number of the element. The ionisation energy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of the $\mathrm{Li}^{2+}$ ion is:

Assertion (A): The number of radial nodes in 3s and 4p orbitals is not equal.

Reason (R): The number of radial nodes in any orbital depends upon the values of $n$ and $l$ which are different for 3s and 4p
orbitals.

The shape of $p$-orbital is