Lithium has only two naturally occuring isotopes: lithiumi-6 and lithium-7.  Lithium-6 has a mass of 6.01512 and makes up 7.42 percent of all naturally occuring lithium.  Lithium-7 has a mass of 7.016 and makes up the remaining 92.58 percent.   What is the atomic mass of lithium?

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.