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Question
Which two elements would have the most similar atomic radii?
Which two elements would have the most similar atomic radii?
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Solution
The correct option is A Boron and silicon
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 and exhibits diagonal relationship. Some
important similarities between boron and silicon are given below,
(1) Both boron and silicon are typical non-metals, having high m.pt. b.pt nearly same densities
(2) Both of them do not form cation and form only covalent compounds.
(3) Both exist in amorphous and crystalline state and exhibit allotropy.
(4) Both possess closer electronegativity values (B=2.0; Si=1.8).
(5) Both form numerous volatile hydrides which spontaneously catch fire on exposure to air and are easily hydrolyzed.
Hence, option A is correct.
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 and exhibits diagonal relationship. Some important similarities between boron and silicon are given below,
(1) Both boron and silicon are typical non-metals, having high m.pt. b.pt nearly same densities
(2) Both of them do not form cation and form only covalent compounds.
(3) Both exist in amorphous and crystalline state and exhibit allotropy.
(4) Both possess closer electronegativity values (B=2.0; Si=1.8).
(5) Both form numerous volatile hydrides which spontaneously catch fire on exposure to air and are easily hydrolyzed.
Hence, option A is correct.
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