Another important property of atoms in organic molecules is the concept of electronegativity. If you understand that electrons are strongly attracted by certain elements (e.g., N, O, Cl, etc.) and easily lost by other elements (e.g., H, Na, Si, Zn, Mg, Ca, etc.), then it helps to predict the properties of a structure and predict how it will react.
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Thanks for the link.
How can one forget about electronegativity. Yes I have heard the term many times during my studies. Fluorine being the most electronegative. Another concept is resonance, I understand what it is but I am still learning. I get that it lowers the overall energy level. I had a quiz recently to draw up all the resonance forms of a molecule, I think there were 6 and I could only find 3. I still have some learning to do.