Hello Mike,

 DW>> Nope. When energy is "released", going someplace else
in the form of
 DW>> light, sound, etc., it takes a tiny bit of mass with it. The total
 DW>> mass  of the products of an explosion is less than the mass of the
 DW>> material  just prior to the explosion.

 MR> For the electron there is no energy involved in maintaining
 MR> its orbital. Its excitation state does but the equivalent
 MR> mass is insignificant.

No, it is not insignificant, that is the whole point. The mass involved is
/exactly/ equivalent to the energy released when the electron drops from
the excited state to the ground state.

Cheers, Michiel

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