[1] Lead has an atomic weight of 207 plus, and its atomic number is 82. This atomic number corresponds to its net positive nuclear charge. Gold on the other hand, has an atomic weight of 197, with an atomic number of 79.
The loss of two alpha particles and the loss of a single beta particle in a molecule of lead, causes that molecule to become an isotopal molecule of gold, with an atomic number 79, and the atomic weight of 199. For all practical commercial purposes, this is the same as true gold.—Author.
[2] Platinum has a weight of 195 plus, and a net Positive nuclear charge of 78.—Author.