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Reference.org
Boride
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<p>A boride is a compound between <a href="/facts/Boron/Pmwgd7Mf">boron</a> and a less <a href="/facts/Electronegativity/H7Vq7Uah">electronegative</a> element, for example <a href="/facts/Silicon_boride/lr2mul4e">silicon boride</a> (SiB3 and SiB6). The borides are a very large group of compounds that are generally high melting and are covalent more than ionic in nature. Some borides exhibit very useful physical properties. The term boride is also loosely applied to compounds such as B12As2 (N.B. Arsenic has an electronegativity higher than boron) that is often referred to as <a href="/facts/Boron_arsenide/lFqmh098">icosahedral boride</a>. </p>