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Download Study Guide - Chapter 12 Quiz
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Chapter 12 Study Guide - The Periodic Table Dmitri Mendeleev A.. He arranged elements in order of atomic mass. He noticed that they had similar properties that occurred in a repeating pattern, every 7 elements B. He was able to predict the properties of elements not yet found. Periodic - describes something that occurs or repeats at regular intervals Henry Moseley - determined the number of protons, the atomic number, in an atom A. Re-ordered the periodic table according to atomic number Periodic law - states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements Metals - most elements are metals A. most found to the left of the zigzag line B. most have few electrons in their outer energy level C. most are solid at room temperature Nonmetals A. found to the right of the zigzag line B. most have an almost complete set of electrons in the outer level C. More than half are gases at room temperature Metalloids - also called semiconductors A. border the zigzag line B. about half of a complete set of electrons in the outer energy level Each element is identified by a chemical symbol Period - a horizontal row of elements in the periodic table 1. Most reactive elements on far left (alkali metals) 2. Least reactive elements on the far right (noble gases) Group - a vertical column of elements in the periodic table 1. Elements in a group share chemical properties