The mass of an atom is the sum of the masses of protons, neutrons and electrons.
well, that is quite a coincidence but it is most definietly not his fault she should learn how to keep up with her grades & have a boyfriend if she can't, well then he's too good for her [:
variation means to be different also the meaning is used in science
They are called "haptens" (incomplete anitgens)
to separate vinegar you must first heat is to 1000 degrees they will separate and you can scoop them out with a fork. No not a spoon, it would melt the spoon.