Elements that give electrons and can oxidize what what property about them ?
Perhaps the simplest definition of electronegativity is that of Leland C. Allen , who has proposed that it is related to the average energy of the valence electrons in a free atom , formula_9 where εs , p are the one - electron energies of s - and p - electrons in the free atom and " n " s , p are the number of s - and p - electrons in the valence shell .