I need story about cerium?

What is the number of atoms in 3.54 mol s

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

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.