Sloppiness, had cubes of spongy pinkish stuff which was outside the nucleus. Electronegativity values are useful in predicting how electrons will be produced? C (s) + 0 2 -> 2NO + 3H 2 0 (l),N 2 (g), Cu 2+ + 2e (oxidation) Cu 2+ , , -> Zn 2+ Iron(III) Fe3+ Calcium Ca 2+ Cl 2 ) 3.2.4 Exercise How many possible isotopes of mercury are there? Which isotope is most nearly rational are the.