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 $3$.

Element	Period and Group
$Q$	Period $2$,Group $15$
$P$	Period $3$,Group $2$

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

Similar Questions

Consider the following information about elements $P$ and $Q$:

Element Period and Group

$Q$ Period $2$,Group $15$

$P$ Period $3$,Group $2$

Then the formula of the compound formed by $P$ and $Q$ elements is:

The maximum valency of an element with atomic number $7$ is

Using the Periodic Table,predict the formulas of compounds which might be formed by the following pairs of elements:
$(a)$ Silicon and bromine
$(b)$ Aluminium and sulphur

Assertion : $HClO_4$ is a stronger acid than $HClO_3$.
Reason : Oxidation state of $Cl$ in $HClO_4$ is $+VII$ and in $HClO_3$ is $+V$.

Which among the following pairs of elements show the highest oxidation state of $+7$ in their different compounds? (Atomic numbers: $Cr=24, V=23, Mn=25, Cl=17, S=16$)

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