The total energy of an electron in ground state of hydrogen atom is -13.6eV. What is the signifi cance of negative sign?

The energy of electron in 3rd orbit of hydrogen atom is:

The total energy of an electron in the ground state of a hydrogen atom is -13.6 eV. : What do you mean by ground state of a hydro gen atom ?

Energy of ground state of hydrogen atom is - 13.6 eV. What is its ionisation potential?

Energy of an electron in the ground state of hydrogen atom is -2.18 xx 10^(-18) J . Calculate the inoisation enethalpy of atomic hydrogen in J mol^(-1) .