Question

Can someone please help me I suck at chemistry.

15. The radioisotope radon-222 has a half-life of 3.8 days. How much of a 198.6 g sample of radon-222 would be left after approximately 23 days? (Show your work)



16. How can an element be artificially transmuted? Give an example that has an element and what it is transmuted into.



17. Why does the mass and charge of an alpha particle make it less penetrating than a beta or gamma? Discuss both the mass and the charge?

Answer 1

15. So half-life means after 3.8 days, this amount is halved.
After 3.8 days: 99.3
After 7.6 days: 49.65
After 11.4 days: 24. 825
After 15.2 days: 12.4125
After 19 days: 6.20625
After 22.8 days: 3.103125
So in about 23 days, you'd have about 3.1 grams left.

Don't know about the rest, but I hope I helped on this one :)