An element that has been broken down and released particles and energy is said to be

Radioactive dating, is the answer
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It is said to be radioactive. Hope this was helpful because I'm learning this in school and I think it's right.

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Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.