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Alk. Alkn. Halo. Nob
Alkali, Alkaline Earth Metals, Halogens and Noble Gases
Term | Definition |
---|---|
Alkali Metals | Not found free in nature, because of high reactivity. Goes to negative electrode during electrolysis. Ratio with chlorine: 1:1 (Ex. LiCl, NaCl) Ratio with oxygen: 2:1 (Ex. Li20, Na2O) Is a metal. Has 1 valence electron. Column number 1 of Periodic Tab |
Alkaline Earth Metals | Not as reactive as Alkali metals. Moves to negative electrode during electrolysis. Has 2 valence electrons. Is a metal Ratio with oxygen: 1:1 (Ex. MgO, BeO, CaO) Ratio with chlorine: 1:2 (Ex. MgCl2, BeCl2) Column number 2 of Periodic Table. |
Halogens | Reactive elements. Not found free in nature. Moves to positive electrode. Has 7 valence electrons. Nonmetal. Ratio with sodium: 1:1 (Ex. NaI, NaCl, NaF) Ratio with calcium: 2:1 (Ex. CaCl2, CaBr2) Column number 17 of Periodic Table. |
Noble Gases | Found free in nature, as they are unreactive. Monatomic elements. Has 8 valence electrons. Column number 18 of Periodic Table. |