If the atomic number is 3 and the mass number is 7 what is the number of protons

Two completely different compounds may contain identical elements. True False

Give two reasons why carbon is so interesting that it has a whole branch of chemistry set aside just to study carbon compounds.

How much energy, in calories, is required to change a 25.00g of ice at - 10.00C to water at 35.00C?

Which statement best explains why radon and krypton do not bond easily with other elements? A. They have many electron shells, so their protons do not attract electrons strongly. B.

The kinetic molecular theory (KMT) deals specifically with

The three major groups p On the periodic table are the

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?

Why do you not want any of the water on the outside of the test tube to drip off into the calorimeter?