Subjective Type

Calculate the electronegativity of silicon using Allred Rochow method. Covalent radius of silicon is 1.175 $$ \overset{o}{A} .$$

Solution

Allred-Rochow equation is,

$$ X= 0.359 \frac {Z_{eff} }{r^2} + 0.744 $$

$$( {Z_{eff} } $$ is calculated on the basis of Slater's rules taking all the
electrons.)

Electronic configuration of Si is $$ 1s^2 , 2s^2, 2p^6, 3s^2 3p^2 $$

$$( {Z_{eff} } =14-(0.35\times3+0.85\times8+1\times 2)=4.15$$

$$X = 0.359 \dfrac {4.15}{(1.175)^2 } + 0.744 = 1.82 $$

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