Number of elements from the following that CA | vedclass

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(D) The group valency is determined by the number of valence electrons or $8$ minus the number of valence electrons.Elements in the second period $(N,

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$3$

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(D) The group valency is determined by the number of valence electrons or $8$ minus the number of valence electrons.Elements in the second period $(N, O, F)$ cannot exhibit valencies matching their group number (e.g.,$N$ in group $15$ cannot show a valency of $5$) because they lack vacant $d$-orbitals in their valence shell.$B, C, Al, Si, P, S$ can exhibit valencies corresponding to their group numbers.Thus,the elements that cannot form compounds with valencies matching their group valencies are $N, O, F$.The total count is $3$.

Number of elements from the following that $CANNOT$ form compounds with valencies which match with their respective group valencies is
$B, C, N, S, O, F, P, Al, Si$

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Number of elements from the following that $CANNOT$ form compounds with valencies which match with their respective group valencies is $B, C, N, S, O, F, P, Al, Si$