What is the significance of negative electronic energy?
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energy of an electron in nth orbital is given by En = -13.6 × Z²/n² eV , where Z is atomic number and n is nth orbit.
here you see energy is negative . This shows Electric force acts between electron and nucleus is attractive in nature. Higher the value of energy in negative , higher will be force of attraction between them.
As you know, according to Coulombs law, two opposite nature charges attract towards itself. Here nucleus is positive nature [ because nucles is combination of protons and neutrons , protons are positive charges and neutrons are neutral in nautre ] and electron is negative in nature. So, electric force must be attractive . So, electric energy must be negative.
here you see energy is negative . This shows Electric force acts between electron and nucleus is attractive in nature. Higher the value of energy in negative , higher will be force of attraction between them.
As you know, according to Coulombs law, two opposite nature charges attract towards itself. Here nucleus is positive nature [ because nucles is combination of protons and neutrons , protons are positive charges and neutrons are neutral in nautre ] and electron is negative in nature. So, electric force must be attractive . So, electric energy must be negative.
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When an electron moves and comes under the influence of nucleus, it does some work and spends its energy in this process. Hence, the energy of the electron decreases from zero to become a negative value.
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