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Name ---------------------------- CIlL<;S ----------- Date - - - - - - Section 1 Review SECTION VOCABULARY atom the smallest unit of an element that main tains the chemical properties of that element electron a subatomic particle that has a negative charge element a substance that cannot be separated or broken down into simpler substances by chemical means isotope one of two or more atoms that have the same number of protons (atomic number) but different numbers of neutrons (atomic mass) matter anything that has mass and takes up space neutron a subatomic particle that has no charge and that is located in the nucleus of an atom proton a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons of the nucleus is the atomic number, which determines the identity of an element 1. Describe Complete the chart below to describe the properties of the subatomic particles. I Proton i ! Charge I Ioutside the nucleus Location I Neutron J I I in the nucleus I 2. Compare What is the difference between a chemical property and a physical property? 3. Apply Concepts An atom has 14 protons and 15 neutrons. What is its mass number? What element is it an atom of? Explain your answer. You can use the periodic table to help you answer. 4. Explain Why do isotopes of an element have the same atOInic number but different mass numbers? 5. Infer Sodium and potassium are in the same group on the periodic table. Name two other ways sodium and potassium are similar. Copyright © Holt :VkDougai. All rights reserved. Holt McDougal Earth Science 50 Earth Chemistry