non-metals. account for around 20% of known. elements. . The periodic table can be used to find out if an element is a metal or a non-metal. Metals are found on the left and in the middle, whereas.. sodium-22. sodium (Na), chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table. Sodium is a very soft silvery-white metal. Sodium is the most common alkali metal and the sixth most abundant element on Earth, comprising 2.8 percent of Earth’s crust. It occurs abundantly in nature in compounds, especially common salt.
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Metal + Single Non-Metal: Sodium chloride, NaCl Potassium sulfide, K 2 S Aluminum oxide, Al 2 O 3: Ternary Ionic: Metal + Group of Non-Metals. Sodium nitrate, NaNO 3 Calcium carbonate,CaCO 3 Magnesium hydroxide Mg(OH) 2: Ionic with Transition Metal: Transition Metal with Non-Metal or Polyatomic Ion:. Updated on January 28, 2020. Elements of the periodic table are grouped as metals, metalloids or semimetals, and nonmetals. The metalloids separate the metals and nonmetals on a periodic table. Also, many periodic tables have a stair-step line on the table identifying the element groups. The line begins at boron (B) and extends down to polonium.