Chemical Bond

The preceding discussion suggests that most chemical bonds are polar; that is, one end of the bond is more positive than the other end. In the bond formed between hydrogen (electronegativity = 2.2) and sulfur (electronegativity = 2.6), for example, neither atom has the ability to take electrons completely from the other. Neither is equal sharing of electrons likely to occur. Instead, the electrons forming the hydrogen-sulfur bond will spend somewhat more time with the sulfur atom and somewhat less time with the hydrogen atom. Thus, the sulfur end of the hydrogen-sulfur bond is somewhat more negative (represented as δ-) and the hydrogen end, somewhat more positive ( δ+).