b Po undergoes four decay reactions: B, a, B, a. Step 1. 218 Po undergoes B decay to give 218 At 85 84 In the second step, At-218 undergoes a decay. What is the product of this step? symbol = mass number = atomic number =

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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.