I have two questions about biochemistry?

Let me know if this helps for #1 on your list.

<a rel="nofollow" href="https://http://www.kentchemistry.com/links/bonding/bondingflashes/bond_types.swf" target="_blank">https://http://www.kentchemistry.com/links/bonding/bondingflashes/bond_types.swf</a>

Thnx for replying. Yes, this is what i was looking for. Do you know the answer to #2. THanks alot for answering.

This should help

<a rel="nofollow" href="https://http://www.learnerstv.com/lecturenotes/chemistry/basicchemistry17.swf" target="_blank">https://http://www.learnerstv.com/lecturenotes/chemistry/basicchemistry17.swf</a>

Basically, electronegativity is the ability of an ELEMENT to attract more electrons. The atom which attracts electrons more, is said to be highly electronegative. For example, fluorine has the highest electronegativity as it can attract electrons most. Polarizing power is the ability of a CATION (positive ion) to attract SHARED pair of electrons towards itself. An example, Na+ attracts cloud of electron of Cl- in NaCl. Therefore, the term polarity is the unequal sharing of electrons causing one side of the molecule to be more + and the other side more - (negative).