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electronegativity increases across a period (left to right) and also decreases down a group so the general trend is diagonally across the periodic table from left to right (excluding the noble gases) fluorine is the most electronegative element and also the most reactive non-metal. The higher the associated electronegativity number, the more an element or compound attracts electrons towards it. The most electronegative atom, fluorine, is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7. First Ionization Energy of Fluorine You can get the atom to be stable/unstable by adjusting the number of neutrons Adding electrons will change it from a +ion to neutral atom, to ion depending on how many electrons you add Adding electrons you can The symbol is the same as the first letter of the element. PART III: ISOTOPES 12.