The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

In terms of Rydberg’s constant $R$, the wave number of the first Balmer line is

The largest wavelength in the ultraviolet region of the hydrogen spectrum is ${\rm{122 }}\,{\rm{nm}}$. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer is)

What is the radius of iodine atom (at. no. ${\rm{53}}$, mass number ${\rm{126}}$)

The wavelength of the first line of Balmer series is $6563\,\,{A^0}$. The Rydberg constant for hydrogen is about

If an atom loses an electron, what happens to its overall charge?

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths ${\lambda _1}:{\lambda _2}$ emitted in the two cases is

For ionizing an excited hydrogen atom, the energy required (in $eV$) will be

What is the radius of iodine atom (at. no. ${\rm{53}}$, mass number ${\rm{126}}$)

In Bohr’s model, if the atomic radius of the first orbit is ${r_0}$, then the radius of the fourth orbit is

When an electron in a hydrogen atom jumps from n=4 to n=2, the radiation emitted belongs to which series?