**Question 1**

Which type of radioactive particle(s) has/have been emitted in the following equation?

214 84 Po –> 210 82 Pb + ?

**Question 2**

Which type of radioactive particle(s) has/have been emitted in the following equation?

214 83 Bi –> 214 84 Po + ?

**Question 3**

Which type of radioactive decay is represented in the following equation?

12 6 C –> 14 7 N + 0 -1 e

**Question 4**

Strontium-90 is a radioisotope that will decrease in mass by one-half every 29 years. How many years will it take 10.0-gram sample of strontium-90 to decay to 2.50 grams?

**Question 5**

What percentage of strontium-90 remains in a sample after three-half lives have passed?

**Question 6**

A radioactive isotope has a half-life of 2 years. What fraction of isotope is left after 2 years?

**Question 7**

Which of the following represents a radioactive isotope that has gone through two half-lives?

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