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added metallicity
'''Metals''' are shiny, [[solid]], and [[conductive]] substances, such as [[iron]]. They contrast with the [[nonmetal]]s. They are generally found on the left side of the [[periodic table of the elements|periodic table]]. Most [[elements]] are metals. Some metals are very strong and light, like [[titanium]]. Others are soft and heavy, like [[lead]]. The [[Alkali Metal|alkali metals]] and [[alkali earth metal]]s have to be stored in oil because they oxidize explosively when they come into contact with water, even water vapor in the air.
'''Metals''' are shiny, [[solid]], and [[conductive]] substances, such as [[iron]]. They contrast with the [[nonmetal]]s. They are generally found on the left side of the [[periodic table of the elements|periodic table]]. Most [[elements]] are metals. Some metals are very strong and light, like [[titanium]]. Others are soft and heavy, like [[lead]]. The [[Alkali Metal|alkali metals]] and [[alkali earth metal]]s have to be stored in oil because they oxidize explosively when they come into contact with water, even water vapor in the air.
In [[astronomy]] and [[cosmology]], the term "metals" includes any elements other than [[hydrogen]] or [[helium]]. This is termed [[Metallicity]].
[[category:chemistry]]
[[category:chemistry]]
[[Category:Metals]]
[[Category:Metals]]