The Periodic Table Introduction to the Periodic Table
The Periodic Table Introduction to the Periodic Table 6. 1
I. Development of the Periodic Table A. Mendeleev’s Contribution a. b. c. B. 1869 first periodic table published Left gaps for undiscovered elements Made predictions for unknown elements Moseley’s Improvement a. b. Rearranged table by atomic number rather than atomic mass Made clear how many undiscovered elements there were
I. The Modern Periodic Table A. B. II. Period - row of elements in the periodic table whose properties change gradually and predictably Groups - elements that have similar physical or chemical properties Sections of the Periodic Table A. Two Sections a. b. Groups 1, 2, 13 -18: representative elements Groups 5 -12: Transitional elements
A. B. Inner transitional elements below the main table Metals, Nonmetals, and Metalloids a. b. c. Metals - luster, good conductor, malleable, ductile, usually solid Nonmetals - poor conductors, usually gasses Metalloid - shares characteristics of metals and nonmetals
A. The Element Keys a. b. B. Table contains name, atomic number, symbol, atomic mass Elements are marked with their state of matter Symbols for the Elements a. b. c. One or two letter symbols based on the element’s name Do not always match current name Can be named after people or places.
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