Why do chemists use relative masses of atoms compared to a reference isotope rather than the actual masses of the atoms?

If an atom has 35 protons in the uncles , how many elements will it have orbiting the nucleus

Alarge increase in gas prices creates a demand for cars with good gas milage. it takes months for car companies to make these cars. how do you describe this market for cars

What trade did europeans want most before the 1800s ivory wood slaves gold