TeCl4 (tellurium tetrachloride) has one tellurium atom and four chlorine atoms. In the lewis structure of TeCl4, there are four single bonds around the tellurium atom, with four chlorine atoms attached to it. Each chlorine atom has three lone pairs, and the tellurium atom has one lone pair.
Here’s how you can draw the TeCl4 lewis structure step by step.
Step #1: draw sketch
Step #2: mark lone pairs
Step #3: mark charges (if there are)
Let’s break down each step in detail.
#1 Draw Sketch
- First, determine the total number of valence electrons
Hence, tellurium has six valence electrons and chlorine has seven valence electrons.
Since TeCl4 has one tellurium atom and four chlorine atoms, so…
Valence electrons of one tellurium atom = 6 × 1 = 6
Valence electrons of four chlorine atoms = 7 × 4 = 28
And the total valence electrons = 6 + 28 = 34
- Second, find the total electron pairs
We have a total of 34 valence electrons. And when we divide this value by two, we get the value of total electron pairs.
Total electron pairs = total valence electrons ÷ 2
So the total electron pairs = 34 ÷ 2 = 17
- Third, determine the central atom
We have to place the least electronegative atom at the center.
Since tellurium is less electronegative than chlorine, assume that the central atom is tellurium.
Therefore, place tellurium in the center and chlorines on either side.
- And finally, draw the rough sketch
#2 Mark Lone Pairs
Here, we have a total of 17 electron pairs. And four Te — Cl bonds are already marked. So we have to only mark the remaining thirteen electron pairs as lone pairs on the sketch.
Always start to mark the lone pairs from outside atoms. Here, the outside atoms are chlorines.
So for each chlorine, there are three lone pairs, and for tellurium, there is one lone pair.
Mark the lone pairs on the sketch as follows:
#3 Mark Charges
Use the following formula to calculate the formal charges on atoms:
Formal charge = valence electrons – nonbonding electrons – ½ bonding electrons
For tellurium atom, formal charge = 6 – 2 – ½ (8) = 0
For each chlorine atom, formal charge = 7 – 6 – ½ (2) = 0
Here, both tellurium and chlorine atoms do not have charges, so no need to mark the charges.
And in the above structure, you can see that the central atom (tellurium) forms an octet. Hence, the octet rule is satisfied.
Therefore, this structure is the stable lewis structure of TeCl4.
Next: SF5– Lewis Structure