Why does the atom not attain stablitity on its own yet it has it's own energy?

There are 92 naturally occurring atoms and most are quite stable, so your question is not clear.

Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. Anybody who uses the word in any other context either does not know what he is talking about, or is peddling something you don't need.