13. Adding up all of the of all of the individual atoms within one molecule of a compound will determine the molecular mass of the compound.
A. atomic numbers
B. electrons
C. atomic masses
D. protons

In which of the following belong to a category called the main group of elements? nonmetals. transition elements. halogens. alkali metals. it can be more than one answer!

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid