Answer:
Non-metallic element of group 13 is
boron. It is grey-black and very hard in nature. It has high melting point,\[2300{}^\circ
C\].It exists in two allotropic forms: (a) crystalline solid(b) amorphous powder.
It forms trifluoride,\[B{{F}_{3}}\].\[B{{F}_{3}}\]acts as a Lewis acid as it is
an electron deficient compound.
\[B{{H}_{3}}+\,:N{{H}_{3}}\xrightarrow{{}}\underset{Adduct}{\mathop{{{H}_{3}}N}}\,\xrightarrow{{}}B{{F}_{3}}\]
\[N{{H}_{3}}\]donates an
electron pair which is accepted by boron to saturate its outer shell. Maximum
covalency of boron is four as its valency shell contains only four orbitals.
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