Among the 15th group elements, as we move from nitrogen to bismuth,...

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Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less
\( \mathrm{P} \)
pronounced and trivalency becomes more
W
pronounced due to
(1) Non metallic character
(2) Inert pair effect
(3) High electronegativity
(4) Large ionization energy
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