Structure of atom practice · Mixed difficulty

If there are five radial nodes, when what can be the correct representation of the orbital for $n = 8$

The number of unpaired electrons in the ${Fe}^{2+}$ ion is

Angular momentum of electron in 3rd stationary orbit of hydrogen atom is

If the uncertainty in the position of electron is zero, the uncertainty in its momentum would be

What is the packet of energy called?

The last electron placed in the third (n=3) quantum shell for:

Consider the following pairs of electrons
$\begin{array}{cccccccccccccccccccc} {\mathrm{(A)}\,\,\mathrm{(a)}\,\mathrm{n = 3,}\,\,\mathrm{l = 1,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = 1,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = + }\frac{\mathrm{1}}{\mathrm{2}}}\\ {\,\,\,\,\,\,\,\,\,\,\,\mathrm{(b)}\,\mathrm{n = 3,}\,\,\mathrm{l = 2,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = 1,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = + }\frac{\mathrm{1}}{\mathrm{2}}}\\ {\,\mathrm{(B) (a) n = 3,}\,\,\mathrm{l = 2,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = } - \mathrm{2,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = } - \frac{\mathrm{1}}{\mathrm{2}}}\\ {\,\,\,\,\,\,\,\mathrm{(b) n = 3,}\,\,\mathrm{l = 2,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = } - 1\mathrm{,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = } - \frac{\mathrm{1}}{\mathrm{2}}}\\ {\mathrm{(C)}\,\mathrm{(a) n = 4,}\,\,\mathrm{l = 2,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = 2,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = + }\frac{\mathrm{1}}{\mathrm{2}}}\\ {\,\,\,\,\,\,\,\,\mathrm{(b) n = 3,}\,\,\mathrm{l = 2,}\,{\mathrm{m}_\mathrm{l}}\mathrm{ = 2,}\,\,{\mathrm{m}_\mathrm{s}}\mathrm{ = + }\frac{\mathrm{1}}{\mathrm{2}}} \end{array}$
The pairs of electrons present in degenerate orbitals is/are:

In the Balmer series of $\mathrm{H}$-spectrum, successive lines tend towards a limiting value of

The unit of wavelength (nm) is equal to:

The electronic configuration of P in ${\mathrm{H}_3}\mathrm{P}{\mathrm{O}_4}$ is

Statement - I: If a nucleus may undergo positron decay as well as K-capture, the amount of
energy released in positron decay is more than that in K-capture.

Statement - II: The loss in K-capture is equal to the difference in atomic masses of parent
nucleus and the daughter nucleus but in positron decay, additional mass loss equal to the
mass of two electrons also occur.

Total number of electrons having $n + l = 3\,in\,Cr\left( {z = 24} \right)$ atom in its ground state is

A laser used to read CDs emits red light of wavelength 700 nm. How many photons does it emit each second if its power is 1.0 W?

Uncertainty in position of a 0.25g particle is ${10^{ - 5}}m.$ The uncertainty in its velocity will be

The total spin resulting from a ${d^7}$ configuration is:

An atom has the electronic configuration of $1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^{10}, 4 s^2 4 p^5$. Its atomic mass is 80 . Its atomic number and the number of neutrons in its nucleus shall be:

$n,\,\,l$ and $m$ values of orbitals A and B are given below.
$\begin{array}{cccccccccccccccccccc} {}&n&l&m \\ {\text{A}}&3&2&0 \\ {\text{B}}&3&1&0 \end{array}$
Which statement about A and B orbitals is incorrect?

a. A has more energy than B

b. A possess electron density along axial direction only

c. B has one angular node and one radial node

d. Probability of finding electron density in B is zero along XZ-plane.

The radiation is emitted when a hydrogen atom goes from a higher energy state to a lower energy state. The wavelength of one line in visible region of atomic spectrum of hydrogen is $6.63 \times 10^{-7} \mathrm{~m}$. Energy difference between the two states is

If ${E_1},{E_2}$ and ${E_3}$ represents kinetic energy of electron, $\alpha -$ particle and proton respectively (having same De Broglie wavelength) then

The electron density of ${d_{xy}}$ orbital in yz plane is

Statement (S): The location and momentum of an electron in an orbital are complementry to each other.

Explanation (E): The statement is against Heisenberg uncertainty principle.

The number of nodal planes ‘d’ orbital has

The ground state electronic configuration of $F{e^{3 + }}$ is

Which is not basic postulate of Dalton’s atomic theory?

The electron is

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 of radiation emitted out in the transition $n=4$ to $n=1$ in $\mathrm{Li}^{2+}$ ion is

An increasing order (lowest first) for the values of e/m for electron (e), proton (p), neutron (n) and alpha (α) particle is:

Which of the following electron transition in H-atom will require the energy equivalent to its ionisation energy

What is the mass of a photon of sodium light with a wavelength of 5890 ${A^0}?(h = 6.63\mathrm{ \times }{10^{ - 27}}erg - s)$