How did J. J. Thomson know there was a positively charged part of the atom? and How did Rutherford’s ‘Gold Foil Experiment’ prove that there was a nucleus?

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101