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Science · Chemistry
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1.The least stable nucleus of any atom occurs in the element

A. Hydrogen

b. Helium

c. Iron

D. Uranium

2. A 10.0 g sample of radon 222, which has a half life of 3.8 days, was produced in a laboratory last Monday. On the following Monday, one week later, about how many grams of the sample will remain?

A. 7.5 g

b. 5.0 g

c. 2.5 g

d. 1.0 g

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