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An understanding of the electron-withdrawing or -donating ability of atoms, or a group of atoms, can be used to predict if an organic compound is a good acid or base. In a covalent bond between two different atoms, the electrons in the σ-bond are not shared equally. The electrons are attracted towards the most electronegative atom. An arrow drawn above the line representing the covalent bond can show this. (Sometimes an arrow is drawn on the line.) Electrons are pulled in the direction of the arrow.