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Unit 3—Atomic Theory and the Periodic Table Name Pre-AP Chemistry: Worksheet #3.2 Class Period Date Counting Sub Atomic Particles 1. Would you expect two electrons to attract or repel each other? Explain 2. Why is an atom electrically neutral? 3. Complete this table. Atomic Number Mass number Number of protons 9 Number of neutrons 10 14 47 55 15 25 25 Number of electrons Hyphen Notation Nuclear Symbol