How many grams are in 4.28 x 10^2 atoms of Ca?

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

For the following, determine the type of reaction and then give products.

Which characteristics can be used to differentiate star systems? check all that apply.