16. Write the letter of the correct answer. When chlorine occurs in nature, there are three atoms of chlorine- 35 for every one atom of chlorine-37. Which atomic mass number is closer to the average atomic mass of chlorine? a. 35 amu b. 37 amu

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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.