If a 500.0 g sample of technetium-99 decays to 62.5 g of technetium-99 remaining in 639,000 years, what is the half-life of technetium-99?

please mark me as brainliest and here is the answer- [\][\][\][\][\][\][\][\][\][\][\]

Explanation:

[\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\]\][\][\][\][\][\][\][\][\][\][\]\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\][\]