1. Question: Hint: 2. What is the symbol for the atom that has 9 protons, 10 neutrons and 9 electrons? Chapter: 1 Lesson: 1 What information can you use to determine the identity of the atom? See this sample problem if you need help. Hint: Chapter: 1 Lesson: 1 Question: If a nucleus were the size of the eraser on the end of a pencil (diameter = 0.125 in) what is the diameter of the "atom" with a nucleus this size? (Give your answer in feet.) What is the ratio of the atom diameter to the diameter of the nucleus? (See Figure F01-1-1) See this sample problem if you need help.

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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.