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Why does an atom in the gas state releases energy when an electron is added to it's eletrosphere?

Question asked by Lucas Dias on May 21, 2020
Latest reply on Jun 4, 2020 by Steven Cooke

Hey everyone, I'm a brazilian researcher and I'm having quite a problem in order to find some information. I was wondering if any of you could help me out.

 

My question is: Why does an atom, in the gas state,  releases energy when an electron is added to it's eletrosphere? I founded lots of explanation on internet but none of them were clear enough for me to understand. I mean, all I founded were people saying that the energy release occur due to the atom reaching a more stable state. But why is that so? 

 

I also read that the stress of the electrons cause this energy release, but it wasn't explaining exactly how does this event works.

 

In fact, I'm looking for a answers that will explain this to me. I'd be really glad if someone could solve my doubts or even suggest any book or article that will help me out.

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