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Name Date Class Content Vocabulary LESSON 2 Protons, Neutrons, and Electrons—How Atoms Differ Directions: On each line, write the term from the word bank that correctly replaces the underlined words in each sentence. NOTE: You may need to change the form of a term. atomic number average atomic mass ion isotope mass number nuclear decay radioactive spontaneous 1. Carbon-12, carbon-13, and carbon-14 are examples of atoms of the same element that have different numbers of neutrons. 2. Radioactive elements emit radiation without external force or cause. 3. Nitrogen’s number of protons is seven. 4. A radioactive element goes through a process in which its unstable atomic nucleus changes into another more stable nucleus by emitting radiation. the average mass of the element’s isotopes, weighted according to the abundance of each isotope for the element. 6. Na+ and F– are examples of atoms that are no longer neutral because they have gained or lost electrons. 7. Uranium is an example of an element that is able to spontaneously emit radiation. 8. Carbon-12 is the most abundant isotope of the element; it has a sum of protons and neutrons equal to 12. 28 Understanding the Atom Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 5. Beneath each element’s symbol on the periodic table, there is a number that provides