Structure of atom practice · Mixed difficulty

The mass of one mole of electron is:

According to Bohr's postulates which quantity can take up only discrete values:

Which of the following pairs of nucleides are isodiaphers ?

Which of the following transitions are not allowed in the normal electronic emission spectrum of an atom?

In H atom, the electron is de-excited from 5th shell to 1st shell. How many different lines may appear in line spectrum?

Orbitals processing the same energy are called:

An ion which has 18 electrons in the outermost shell is:

The frequency of radiation absorbed or emitted when transition occurs between two stationary states with energies $E_1$ (lower) and $E_2$ (higher) is given by

The magnetic moment of electron in an atom (excluding orbital magnetic moment) is given by:

In case of photoelectric effect, slope of $\mathrm{V}_0$ vs $\mathrm{v}$ curve is (where $\mathrm{V}_0$-stopping potential, $\mathrm{v}=$ subjected frequency)

What is the packet of energy called?

The shortest wavelength of H atom in the Lyman series is ${\lambda _1}.$ The longest wavelength in the Balmer series of $H{e^ + }$ is

The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively

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

In photoelectric emission the energy of the emitted electrons is:

Statement (S): Specific charge of $\alpha$-particles is twice to that of proton.

Explanation (E): Specific charge is given by $e / m.$

Dimensions of Planck’s constant are:

When beryllium is bambarded with $\alpha$ - particles extremely penetrating 396s which cannot be deflected by electrical or magnetic field are given out. These are

The electric configuration of element with atomic number 24 is

The energy per mole of photon of electromagnetic radiation of wavelength 4000 Å is:

In the atomic spectrum of hydrogen the series of lines observed in the visible region is:

The volume of a proton is approximately;

Amongst the following statements, select the set having statements which was proposed by Dalton.
(1) All the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass.
(2) When gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same $\mathrm{T} \,\&\, \mathrm{P}$
(3) Chemical reactions involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction.
(4) Matter consists of indivisible atoms

If ${S_1}$ be the specific charge (e/m) of cathode ray and ${S_2}$ be that of positive rays, then which is true?

Which principle/rule limits the maximum number of electrons in an orbital to two?

The ratio of e/m,i.e., specific charge for a cathode ray:

Statement (S): All s-orbital in $\mathrm{H}$-atom corresponds to a non-zero probability density at nucleus

Explanation (E): The probability density is given by: $\psi^2$ and $\psi \propto e^{-\frac{Z r}{2 a_0}}$

A certain radio station broadcasts on a frequency of 980 KHz, what is the wavelength of electromagnetic radiation broadcast by the radio station

Uncertainty in the position of an electron $\left( {\mathrm{mass} = 9.1 \times {{10}^{ - 31}}\mathrm{kg}} \right)$ moving with a velocity 300 $\mathrm{m}{\mathrm{s}^{ - 1}}$ accurate upon 0.001% will be
$\left( {h = 6.63 \times {{10}^{ - 34}}\mathrm{\;Js}} \right)$

Assertion : In case of isoelectronic ions the ionic size increases with the increase in atomic number.

Reason : The greater the attraction of nucleus, greater is the ionic radius