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1.
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
. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is
2.
What is the radius of Iodine atom? (Atomic no.53, mass no.126)
3.
Hydrogen atom excites energy level from fundamental state to 
. Number of spectrum lines, according to Bohr, is
. Number of spectrum lines, according to Bohr, is
4.
If elements with principal quantum number 
> 4 not allowed in nature, the number of possible elements would be
> 4 not allowed in nature, the number of possible elements would be
5.
Ionisation potential of hydrogen atom is 13.6 eV. The least energy of photon of Balmer series is