Father of the periodic table, Mendeleev, groups, periods, Columns on the periodic table , Mendeleev, groups, periods, Rows on the periodic table, Mendeleev, groups, periods, Period numbers tell us the number of , protons, electrons, energy levels, Currently accepted model of the atom, energy levels, electron cloud, protons, The periodic table is organized in order of increasing , atomic number, energy levels, electrons, Groups numbers 1, 2, and 13-18 tell us the number of ______ ______, protons, neutrons , valence electrons, Elements in the 1st group are called, alkali metals, alkaline earth, noble gases, halogens, Elements in the 2nd group are called, alkali metals, alkaline earth, noble gases, halogens, Elements in group 18 are called, alkali metals, alkaline earth, noble gases, halogens, Group 17 elements are called, alkali metals, alkaline earth, noble gases, halogens, Large group of elements on the periodic table that have luster, are malleable & ductile, conduct electricity, Metalloids, Non-metals, Metals, Large group of elements on the periodic table that are dull, are brittle, insulators and mostly liquid or gas, Metalloids, Non-metals, Metals, Large group of elements on that sit on the "stair step" that share properties with metals and nonmetals, Metalloids, Non-metals, Metals.

Periodic Table

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