Question

what does negative electronic energy for hydrogen means?​

Answer 1

Answer:

It means the tendency of hydrogen to gain an electron is negative, the main reason behind this negative energy is the electron-electron repulsion between the comming electron and already present electron in the shell. It is common convention to say an unbound electron has zero (binding) energy.

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Answer 2

Answer:-

The energy of an electron in the orbit of an atom is negative.It shows that electron is bound to the nucleus.Greater the value of negative energy,more tightly the electron is bound to the nucleus.Binding energy of a electron is E= - (13.6/n^2).