Question

why electronic energy are negative
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Answer 1

Answer:

Electrons are always marked negative Hence electronic energy is also always taken as negative. It is because when an electron is at infinite distance from nucleus , there the kinetic energy of that electron can not be calculated. So, it is taken to be zero.And thus the energy of electron becomes less negative.

Answer 2

Answer:

It is because when an electron is at infinite distance from nucleus,then there the kinetic energy of that electron cannot be calculated.

So, it is taken to be zero. when that electron comes close to the nucleus ,the stability increases due to the loss of energy of electron and thus the energy of electron becomes less negative. That's why the electrons energy is taken as negative.