The metal is lead, Pb.
One unit of the oxide contains one atom of O (16.00 u).
∴ Mass of oxide = 16.00 u O × (100 u MO/7.17 u O) = 223.15 u MO
Mass of M = mass of MO – mass of O = 223.15 u -16.00 u = 207.2 u
The only element with an atomic mass of 207.2 u is lead (Pb) and the formula of the oxide is PbO.
Cathode Ray experiment to figure out electrons exist -> atoms can be broken up into subatomic particles
Answer: 66
Explanation: To find the mass number you would have to add the number of protons and the number of neutrons.
The subatomic particles that identifies an element and also represents its atomic number would be A. The number of protons.
