Question

ch. 6 - how atoms bond quiz
started: oct 13 at 9:59pm
quiz instructions
this is an open note quiz. good luck.
question 9
draw the lewis structure for h₂s. answer the following about its lewis structure:

1. # of unshared pairs of electrons on the central atom: ____________

2
3
0
1

Explanation:

Step1: Determine central atom

In $H_2S$, sulfur (S) is the central atom as hydrogen (H) can only form one - bond.

Step2: Calculate valence electrons

Sulfur has 6 valence electrons and each hydrogen has 1 valence electron. So in total, $H_2S$ has $6 + 2\times1=8$ valence electrons.

Step3: Form bonds

Each hydrogen forms a single - bond with sulfur, using 2 electrons per bond. So 4 electrons are used in the two S - H bonds.

Step4: Determine unshared pairs

The remaining $8 - 4 = 4$ electrons are placed as unshared pairs on the sulfur atom. Since each unshared pair has 2 electrons, there are $\frac{4}{2}=2$ unshared pairs of electrons on the central sulfur atom.

Answer:

2