Structure of atom practice · Mixed difficulty

Which experiment is responsible for finding out the charge on an electron?

A single electron species in energy level (orbit number $n$ ) with energy $X$ was provided with excess of energy so that it jumps to higher energy level with energy $Y$. If it can emit radiations of six different wavelengths on de-excitement between these two energy levels, then the correct relation is

The energy of a photon is $3 \times {10^{ - 12}}$ ergs. What is its wavelength in nm? $\left( {h = 6.62 \times {{10}^{ - 27}}\mathrm{ergs},\;c = 3 \times {{10}^{10}}\mathrm{cm}/\mathrm{s}} \right)$

Possible number of orientations of a subshell is:

What is the maximum number of electrons in an atom that can have the following quantum numbers $n = 4,\;{m_1} = + 1?$

The radius of Bohr's first orbit in H-atom is 0.053 nm. The radius of second orbit in $\mathrm{H}{\mathrm{e}^ + }$ would be:

Assertion: Dalton's Atomic Theory was later modified when the existence of subatomic particles was discovered.

Reason: The discovery of subatomic particles showed that atoms are not indivisible and can be further broken down into smaller particles.

The speed of the cathode rays is:

The radius of the stationary state which is also called Bohr radius is given by the expression $\mathrm{r_n=n^2 a_0}$ where the value of $\mathrm{a}_0$ is

Which hydrogen like species will have same radius as that of Bohr orbit hydrogen atom?

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

The expression for Bohr's frequency rule is

It the radius of first Bohr orbit be ${a_\mathrm{o}}$, then the radius of the third orbit would be

Two electron in an atm of an element cannot have:

S-I: Wavelength of limiting line of lyman series is less than wavelength of limiting line of Balmer series.

S-II: Rydberg constant value is same for all elements.

The maximum number of atomic orbitals associated with a principal quantum number 5 is:

The maximum number of electrons accommodated in all 5f-orbitals

Which of the given radiations is having high penetrating power and not affected by electrical and magnetic field?

$\mathrm{O}_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.2 $\mathrm{eV}$ more energetic than normal. The dissociation of $\mathrm{O}_2$ into two normal atoms of oxygen requires $482.5 \mathrm{~kJ} / \mathrm{mol}$. The maximum wavelength effective for photochemical dissociation of $\mathrm{O}_2$ is $(1 \mathrm{eV}=$ $96.5 \mathrm{~kJ} / \mathrm{mol}$ )

In $\mathrm{H}$-atom, the wave number ratio is $108: 7$ is for

The energy of an electron in ${n}^{\text {th }}$ orbit of hydrogen atom is

Assertion: Ratio of anode rays is different for different gases.
Reason: Proton is the fundamental particle present in gases.

The correct designation of an electron with $n = 4,l = 3,m = 2,$ and $s = 1/2$ is:

Angular momentum of 2nd Bohr orbit of H – atom is $x$ . Then find out angular momentum in first excited state of $L{i^{2 + }}$ is

If an electron has spin quantum number of $+ \frac{1}{2}$ and a magnetic quantum number of -1, it cannot be represented in an

If the mass of an electron is $9.11 \times {10^{ - 31}}\,{\text{kg}},$ and uncertainty in position is ${10^{ - 8}}{\text{m}},$ the uncertainty in velocity would be:

S-I: There is one nodal regions in 3s-orbital.

S-II: There is one nodal plane in 3s-orbital.

For ${ }^{19} {F}^{-1},{ }^{16} {O}^{-2}, { }^{20} {Ne},$ choose the correct statement.

Which set has the same number of unpaired electrons in their ground state

The mass of a photon with wavelength 3.6 Å  is