What is an example of a change of state

Which other elements contain the same number of outer electrons as sodium

Find the number of moles of argon in 364g of argon.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.