What is Bohr's radius?

What is Bohr's quantum condition?

Obtain the first Bohr radius of muonic hydrogen atom [i.e., an atom in which a negatively charged muon (mu) of mass about 207m_e orbits around a proton].

The radius of first orbits of hydrogen atom is called Bohr radius. (True /false).

What does atomic radius and ionic radius really mean to you ?

What is radius ratio for the co-ordination number 8

If radius of second stationary orbit (in Bohr's atom) is R then radius of third orbit will be :