Please tell me why and how do chemist use the periodic table? Please describe how it describes the following? Groups, Periods, valence electrons, highly reactive, non reactive, size and
mass of atom.

(I need answer ASAP please)

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023