How many of the given compounds the central atom has incomplete d-subshell?
$P F_{3}, P F_{5}, S F_{4}, S e F_{4}, T e C l_{4}, G e X_{4}, S n C l_{4}$ etc

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Solution

${P F}_{3} \to {S P}^{3}$
${P F}_{5} \to {S P}^{3} d$
${S F}_{4} \to {S P}^{3} d$
${S e F}_{4} \to {S P}^{3} d$
${T e C l}_{4} \to {S P}^{3} d$
${G e X}_{4} \to {S P}^{3}$
${S n C l}_{4} \to {S P}^{3}$
$\to {P F}_{3}, {G e X}_{4}, {S n C l}_{4}$ has empty d-orbitals
${P F}_{5} \Rightarrow P - {1 S}^{2} {2 S}^{2} {3 P}^{6} {3 S}^{2} {3 P}^{3}$

S in ${S F}_{4} \Rightarrow (S) {1 S}^{2} {2 S}^{2} {2 P}^{6} {3 S}^{2} {3 P}^{4}$
${1 S}^{2} {2 S}^{2} {2 P}^{6} {3 S}^{2} {3 P}^{3} {3 d}^{1}$
same for ${S e F}_{4}, {T e C l}_{4}$ incomplete d-orbitals
${P F}_{5}, {S F}_{4}, {S e F}_{4}, {T e C l}_{4}$

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