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Someone earlier in this thread mentioned that an ounce of gold and an ounce of lead have the same numbers of protons neutrons and electrons, but Gold has an Atomic Number (number of protons per atom) of 79 and Lead has an Atomic Number of 82. Gold's Atomic Mass (mass relative to one atom of carbon-12) is 196.96655 amu. Lead's is 207.2 amu. So I don't see how that could be possible.
Gram was mentioned, not ounce^_^
The specific gravity of gold is greater than that of lead (19.3,11.3 respectively). What this means is more atoms of gold are packed within a cubic centimeter than atoms of lead.
Yes, according to their atomic mass, lead is heavier than gold (207.2,197.0 respectively). It may sound odd but the property of gold is that the atoms are packed closer together in normal conditions then those of lead. Which is why a gram of gold has exactly the same number of electrons, protons and neutrons as a gram of lead.
Sorry to run off topic m(-.-)m