The school year is nicely wrapped up and New York students are filled with trepidation at the prospect of encountering the chemistry regents face to face which is just a few short days away. Next Tuesday to be exact. Admittedly, there is not much time to learn concepts that should have been learned earlier on in the school year but if you absorbed just a few critical elements along the way you should do pretty well. In other words, you need to put your thinking caps on. One thing that you should have picked up is the concept of the ionic bond. In everyday English, this translates to an electron from an atom( the less electronegative one) is literally transferred to the atom with the greatest electronegativity. Electronegativity is in my estimation is a hunger for electrons in an atom by another dissimilar atom. It actually is an electrostatic attraction for the electron from the lesser electronegative atom. The electron that was transferred resides close to the more electronegative atom. This creates one atom with a positive charge and the other atom has a negative charge. One example that comes to mind is NaCL (sodium chloride). This is the chemical composition of table salt. The Na is the + ion and the Cl is the - ion.
Please note that a combination of atoms of the same element such as O2 share the electrons equally so there is no evidence of electronegativity or polarity. If you would like help with understanding chemistry send me an e-mail!