Which of the following elements has three valence electrons?
a. sodium
b. argon
c. oxygen
d. gallium

__can be defined as which velocity changes

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?

Fred is studying a substance that is made out of only one element. this means that