An electron makes a transition from n = 5 state to n = 2 state in the hydrogen atom. What is the frequency of the emitted photon?

Quantum numbers are a set of numbers that describe the energy and position of an electron in an atom. They are used in quantum physics and chemistry to describe the values of conserved quantities in a quantum system.  Each electron in an atom is described by four quantum numbers: Principal, Azimuthal, Magnetic, Spin.  The first three quantum numbers (n, l, ml) specify the orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital.  The Pauli exclusion principle states that no two electrons in the same atom can have the same set of four quantum... Show more

Quantum numbers are a set of numbers that describe the energy and position of an electron in an atom. They are used in quantum physics and chemistry to describe the values of conserved quantities in a quantum system. 

Each electron in an atom is described by four quantum numbers: Principal, Azimuthal, Magnetic, Spin. 
The first three quantum numbers (n, l, ml) specify the orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital. 
The Pauli exclusion principle states that no two electrons in the same atom can have the same set of four quantum numbers. 

Here are some other details about quantum numbers:
The number of orbitals in a shell is the square of the principal quantum number. For example, 12 = 1, 22 = 4, 32 = 9.
The angular quantum number (l) can be any integer between 0 and n - 1.
The magnetic quantum number (m) can be any integer between -l and +l.
The magnetic quantum number, ml, specifies the relative spatial orientation of a particular orbital. 

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