4
Question
Which of the following element of group IIIA element will show allotropy ?
Which of the following element of group IIIA element will show allotropy ?
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Solution
The correct option is C boron
Due to its small size and similar charge/mass ratio, boron
differs from other group 13 members, but it resembles closely with silicon, the
second element of group 14 to exhibit diagonal relationship. Some important
similarities between boron and silicon are:
a)
Both of them do not form cation and form only
covalent compounds.
b)
Both exists in amorphous and crystalline state
and exhibit allotropy.
Boron can be prepared
in several crystalline and amorphous forms. Well known crystalline forms are
α-rhombohedral, β-rhombohedral, and β-tetragonal.
Due to its small size and similar charge/mass ratio, boron differs from other group 13 members, but it resembles closely with silicon, the second element of group 14 to exhibit diagonal relationship. Some important similarities between boron and silicon are:
a) Both of them do not form cation and form only covalent compounds.
b) Both exists in amorphous and crystalline state and exhibit allotropy.
Boron can be prepared in several crystalline and amorphous forms. Well known crystalline forms are α-rhombohedral, β-rhombohedral, and β-tetragonal.
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