ATOMS Set 4

The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is

What is the radius of Iodine atom? (Atomic no.53, mass no.126)

Hydrogen atom excites energy level from fundamental state to . Number of spectrum lines, according to Bohr, is

If elements with principal quantum number > 4 not allowed in nature, the number of possible elements would be

Ionisation potential of hydrogen atom is 13.6 eV. The least energy of photon of Balmer series is

The wavelength of radiation emitted is when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of hydrogen atom,the wavelength of radiation emitted will be

The first excited state of hydrogen atoms is 10.2 above its ground state. The temperature needed to excite hydrogen atoms to first excited level, is

The figure indicates the energy levels of a certain atom. When the system moves from level to, a photon of wavelength is emitted. The wavelength of photon produced during its transition from level to is

In an atom, the two electrons move round the nucleus in circular orbits of radii and . The ratio of the times taken by them to complete one revolution is

The orbital frequency of an electron in the hydrogen atom is proportional to