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Period 4 element
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===Gallium=== [[File:Gallium crystals.jpg|frameless|left|upright=0.3]] [[Gallium]] (Ga) is an element in [[boron group|group 13]], under [[aluminium]]. Gallium is noteworthy because it has a melting point at about 303 [[kelvin]]s, right around room temperature. For example, it will be solid on a typical spring day, but will be liquid on a hot summer day. Gallium is an important component in the alloy [[galinstan]], along with tin. Gallium can also be found in semiconductors.
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