A nonmetallic element of group 13 , used in making bullet proof ves...

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A nonmetallic element of group 13 , used in making bullet proof vests is extremely hard solid of black
\( \mathrm{P} \) color. It can exist in many allotropic forms and

W has unusually high melting point. Its trifluoride acts as Lewis acid towards ammonia. The element exhibits maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why does the trifluoride act as a Lewis acid.
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