Valence electrons are the highest energy electrons in an atom.
the energy is require to remove an electron from an atom (ionization energy) but when electron is absorbed in an atom energy is released (electron affinity) however 2nd electron affinity is endothermic ,energy is require.
in the third shell, an electron has more energy and is further from the nucleus
The electrons on the outtermost energy level of an atom is called a valence electron.
All electron shells represent an energy level - it doesn't matter if its the outermost shell or not. In order for there to be a release of energy the electron has to be coming from a higher energy state. The only energy state higher than the outer-most electron shell would be a free electron. The only way an electron becomes a free electron is that sufficient was provided to lift it from what-ever electron shell (energy level) it was previously in to escape velocity. The energy that it then releases in returning is then this exact same amount of energy.
Electrons in the outermost energy shell (valence shell) have the most energy.
the lowest energy level occupied by an electron when an atom is in its most stable energy state
Ionization energy is more commonly used to remove the topmost electron in the atom very important information if you are getting ready for a test.
it is the energy required for a mole of atom to loose a mole of electron.
energy released by the electron
When less than half of the outer energy level is filled!
The answer to that would be: An Electron Cloud Model
When an element is in the gaseous state, it is the energy absorbed by that element to make one(the first) outer most electron leave the atom .