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An electron has no specific amount of energy.

According to Bohr's Model of hydrogen atom, the energy of an electron in a shell is given by:

E=-13.6x Z2/n2 E.V.

Where Z is the atomic number of the atom, n is the shell number and E.V. is electron volt, the unit for energy

1E.V. = 1.6 x 10-19 J.

But the Bohr's model was rejected and quantum mechanical model of an atom came into force where

n=principal quantum number and

l=Azimuthal quantum number

are used to determine the energy of an atom.

'n' determines the energy to a larger extent and 'l' to a little extent.

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