Problem: Be sure to answer all parts.The radioactive decay of thallium-206 to lead-206 has a half-life of 4.20 min. Starting with 4.70 x 1022 atoms of thallium-206, calculate the number of such atoms left after 42.0 min. Enter your answer in scientific notation. 

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Be sure to answer all parts.

The radioactive decay of thallium-206 to lead-206 has a half-life of 4.20 min. Starting with 4.70 x 1022 atoms of thallium-206, calculate the number of such atoms left after 42.0 min. Enter your answer in scientific notation.