Potassium (Z = 19) has three primary isotopes: K-39, K-40, and K-41. 1) The half-li fe of K-40 is 1.248 × 109 years. Determine the age of a sample, in years, that once contained 820 Ci but now has 205 Ci.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.