Unit 5: Covalent Bonds

2. a bond formed between two atoms in which electrons are being uequally shared.
7. the temperature at which a substance changes phases from liquid to solid.
8. substances in which the atoms are sharing two or more electrons.
9. substance made of positive and negative ions held together by electrostatic attrations.
11. two valence electrons on an atom that are not being shared in a bond.
13. a pair of electrons that is being shared between two atoms in a covalent bond.
15. a bond formed between two atoms in whcih electrons are shared equally.
17. pictorial representations of covalent bonds with valence electrons that are not being shared as pairs of dots and bonded pairs of electrons as lines connecting atoms.

1. forces that act between molecules, typically much weaker than the forces acting within molecules.
3. the attraction that occurs between nonpolar molecules causing temporary slight polarizations that occur when the normally equal distribution of electrons is shifted.
4. electrons in th highest unfilled energy level, resposible for making chemical bonds.
5. the temperature at which a substance changes phase from liquid to gas.
6. the ability of an atom to attract another atom's electrons when bonded to that atom.
10. a structure such as a molecule in which there is a some separation of positive and negative charges to create a partially charge positive end and a negatively charged end of that particular molecule.
12. an intermolecular attraction that forms between a hydrogen atom in one molecule and the negatively charged portion of another molecule.
14. a theory that states that the shape of molecules are dictated, in part, by the repulsion of the shared electrons and the unused pairs of electrons.
16. a set of eight electrons in an atom's valence shell.