Is evaporation of water a physical or chemical change

Noble gases are the most reactive elements on the periodic table. a. true b. false

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays