Question

part 3b 9 marks choose 3 of 4 (lesson 3b) draw the following covalent bonds a) pcl₃ b) so₂ c) cbr₄ d) seo₃

Explanation:

Step1: Determine central atom for PCl3

Phosphorus (P) is central. It has 5 valence - electrons. Chlorine (Cl) has 7 valence - electrons.
P shares 3 electrons with 3 Cl atoms.
The Lewis structure has P in the center with 3 single bonds to Cl and 1 lone pair on P.

Step2: Determine central atom for SO2

Sulfur (S) is central. S has 6 valence - electrons, oxygen (O) has 6 valence - electrons.
S forms a double bond with one O and a single bond with the other O, and there is 1 lone pair on S.

Step3: Determine central atom for CBr4

Carbon (C) is central. C has 4 valence - electrons, bromine (Br) has 7 valence - electrons.
C forms 4 single bonds with 4 Br atoms.

Answer:

For PCl3: P is in the center with 3 single bonds to Cl and 1 lone pair on P.
For SO2: S is in the center with a double bond to one O, a single bond to the other O, and 1 lone pair on S.
For CBr4: C is in the center with 4 single bonds to Br.