4 years ago

Radon-219 has a half-life of about 4 s.

Mathematics

1 answer:

natulia [17]4 years ago

6 0

Answer:

15.6 mg

Step-by-step explanation:

First 4 s- 500/2= 250 mg

After 8 s- 250/2= 125 mg

After 12 s- 125/2= 62.5 mg

After 16 s- 62.5/2= 31.25 mg

At 20 s- 31.25/2= 15.625 mg

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