# 7. A specific radioactive isotope has a half-time of 30.2 minutes. How long will it take this isotope to decay to 1/8 of its original amount?

7.

A specific radioactive isotope has a half-time of 30.2 minutes. How long will it take this isotope to decay to 1/8 of its original amount?

9. The formula of the ionic compound that forms from two ions ,

A 2+ and R 7-, can be written as AxRy.

What is the value for the x?

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