Who is the english chemist who developed the atomic theory that elements are made up of atoms that are identical and that these can be combined in definite proportions?

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

What conclusion can you draw from this experiment about the components of the black ink?

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.