Which symbols are used to represent different Bohr's orbit?

In an atom the nucleus is made of particles known as protons and neutrons, electrons orbit around the nucleus.

Bohr proposed a model in which the electrons had discrete values of energy, as a result of which they could only orbit in circular orbits at a particular distance from the nucleus. When electrons in an atom were excited they could absorb energy in certain fixed quantities to move to the next orbit. The amount of...

In an atom the nucleus is made of particles known as protons and neutrons, electrons orbit around the nucleus.

Bohr proposed a model in which the electrons had discrete values of energy, as a result of which they could only orbit in circular orbits at a particular distance from the nucleus. When electrons in an atom were excited they could absorb energy in certain fixed quantities to move to the next orbit. The amount of energy was not continuous but discrete in nature. Bohr only suggested the principal quantum number that was later denoted n and could have values represented by the numbers 1,2,3,4... or the letters K,L,M,N,O,P.