Step 1: Allred-Rochow Electronegativity Formula. The Allred-Rochow electronegativity (\( \chi \)) is calculated using the formula: \[\chi = \frac{0.359}{r} + 0.744\] where \( r \) represents the covalent radius in Angstroms.
Step 2: Apply the Formula for Si. For Silicon (Si), the covalent radius \( r = 1.175 \, \text{Å} \). Substituting this value into the formula yields: \[\chi = \frac{0.359}{1.175} + 0.744 = 0.305 + 0.744 = 2.20\]
Step 3: Conclusion. Consequently, the electronegativity of Silicon (Si) is determined to be 2.20, which aligns with option (3).
Given below are two statements:
Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.
Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.
In the light of the above statements, Choose the correct answer from the options given below:
The correct orders among the following are:
[A.] Atomic radius : \(B<Al<Ga<In<Tl\)
[B.] Electronegativity : \(Al<Ga<In<Tl<B\)
[C.] Density : \(Tl<In<Ga<Al<B\)
[D.] 1st Ionisation Energy :
In\(<Al<Ga<Tl<B\)
Choose the correct answer from the options given below :