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Chemistry 1210: General Chemistry Dr. Gina M. Florio 06 September 2012 Lecture Notes Jespersen, Brady, Hyslop, CH 3 Elements, Compounds, and the Periodic Table Structure of the Atom Atom consists of smaller (subatomic) particles: Protons (positively charged) Neutrons (no charge) Electrons (negatively charged) Found in the atomic nucleus e ?1 0 Electrons H+ 1 1 p 1 1 , Protons and n 0 1 Neutrons Matter is typically neutral ? equal number protons and electrons per atom Size: If diameter of nucleus = 1 foot, then diameter of atom ~ 1.9 miles! Ch. 3.1 2 Chapter 1.6 Identification of Atoms Each atom has two ID numbers: 1. Atomic Number (Z) Z = Number of protons Element ? a substance whose atoms contain the same number of protons ? a substance with a unique atomic number, Z Isotope

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