The total energy of an electron in an atom in an orbit is `-3.4eV`. Its kinetic and potential energies are, respectively:

Options

A. 3.4 eV, 3.4 eV
B. `-3.4 eV, -3.4 eV`
C. `-3.4 eV, -6.8eV`
D. `3.4 eV, -6.8 eV`

Explanation

Total energy of electron in `n^("th")` orbit, `E_(n)=(-13.6Z^(2))/(n^(2))eV`.
Kinetic energy of electron in `n^("th")` orbit, `K.E.=(13.6Z^(2))/(n^(2))eV`
Potential energy of electron in `n^("th")` orbit, `P.E.=(-12.2Z^(2))/(n^(2))eV`
Thus, total energy of electron, `E_(n)=-K.E.=(P.E.)/(2)`
`therefore" "K.E.=3.4eV" "["Given "E_(n)=-3.4eV]`
`P.E.=2xx-3.4=-6.8eV`.