Anonymous asked 7/17/2009 The Electron Configuration Of An Oxygen Atom Is 1s22s22p4. How Many Valence Electrons Does An Oxygen Atom Have?
Anonymous asked 7/12/2009 What Is The Reason Of Using A Dark-colored Reagent Bottles In Storing Some Chemicals?
Anonymous asked 7/12/2009 A Simple Experiment To Find Out What Happens To The Volume Of Water When It Freezes?