Which element, Phosphorus or Calcium, is more reactive? Why?

Asample of neon occupies a volume of 375 ml at stp. what will be the volume of neon if the pressure is reduced to 90.0 kpa? a. 422 ml b. 422 l c. 333 ml d. 333 l

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp