The Earth has a mass of about 6×10^24 kg, the average human masses about 70 kg (7×10^2 to use consistent notation). So if you converted all the atoms of the earth into humans (ignoring any losses during transmuting), you’d get about 10^22 people, or 10,000,000,000,000,000,000,000. We currently have about 7 billion (7×10^9 ), so you can see that this is not a situation that’s likely to happen soon, if ever.
Also you can change 1 atom into another, but that would be a physics question.
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