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Why does the first elements in a group s...

Why does the first elements in a group show anomalous behaviour. Give a reason. 

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Group 13 of periodic table consists of boron or aluminium family. Boron being the first member, shows anomalous behaviour due to its small size and high nuclear charge/size ratiom high electrone gastivity and non availability of d-electrons. All the group 13 members forms hydrides, hydroxides, halides showing +3 covalency, however boron forms electron deficient species. Which one is not correct chemical change ?

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The first element of a group differes from its congeners, i.e other members of the group in many ways. These difference may be due to the following i) Small size of atom and ion ii) High electronegetivity iii) Non-availability of low lying d-orbitals The first element of a group shows resemblance with the second element of the adjacent group on the right. This is known as diagonal relationship Metal (M)+ N_(2) rarr "Nitride" underset("hydroysis")overset(H_(2)O)rarr NH_(3) . Metal (M) can be

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Knowledge Check

  • Group 13 of periodic table consists of boron or aluminium family. Boron being the first member, shows anomalous behaviour due to its small size and high nuclear charge/size ratiom high electrone gastivity and non availability of d-electrons. All the group 13 members forms hydrides, hydroxides, halides showing +3 covalency, however boron forms electron deficient species. Which one is not correct chemical change ?

    A
    `H_(3)BO_(3)+3NaOH rarr Na_(2)BO_(3)+3H_(2)O`
    B
    `H_(3)BO_(3)+3ROH rarr R_(3)BO_(3)+3H_(2)O`
    C
    `4BCl_(3)+3LiAlH_(4)rarr 2B_(2)H_(6)+3AlCl_(3)+3LiCl`
    D
    `3B_(2)H_(6)+6NH_(3)overset(" 450 K ")rarr 2B_(3)N_(3)H_(6)+12H_(2)`

  • The first element of a group differes from its congeners, i.e other members of the group in many ways. These difference may be due to the following i) Small size of atom and ion ii) High electronegetivity iii) Non-availability of low lying d-orbitals The first element of a group shows resemblance with the second element of the adjacent group on the right. This is known as diagonal relationship Metal (M)+ N_(2) rarr "Nitride" underset("hydroysis")overset(H_(2)O)rarr NH_(3) . Metal (M) can be

    A
    Li
    B
    Na
    C
    K
    D
    Mg