Introduced to this concept in AP Chemistry
What is it?
- Measure of the change in energy of an atom when an e
is added to it - If adding e
makes atom more stable, energy is given off (exothermic) - If adding e
makes atom less stable, energy must be added (endothermic) - Take the value of the free atom and the result and if the energy is lower energy it has released energy
F (g) + e
As halogens gain electrons they become more stable