Elements in the same group have similar chemical properties because

a their atoms are about the same size
b they have a similar atomic mass
c they have the same number of valence electron
d they have a diagonal relationship

What is the molar mass of potassium nitrate, kno3

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.