The correct expression derived for the energy of an electron in the nth energy level is for H-atom

1.  En=2π2 me4 K2n2 h2

2.  En=-π2 me4 K22n2 h2

3.  En=-2π2 me2 K2n2 h2

4.  En=-2π2 me4 K2n2 h2

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