Which of these molecules has the same number of shared and unshared electron pairs?
a. CCl2F2 b.Br2 c.HCl d.PF3 e.H2S
Answer:
e.H2S
Explanation:
Examining each molecule of each compound to determine the number and types of pairing.
a) CCl₂F₂ : this compound has a total four shared pair of electrons on carbon and no unshared electron pairs
b) Br₂ : this halogen gas has only one shared electron pair and three unshared electron pairs in its structure
c) HCl : here we see that the compound has one shared electron pairs and six number of unshared electron pairs [on chlorine]
d) PF₃ : there are three shared pair of electrons here and the number of unshared electron pairs is one on phosphorous.
e) H₂S : this compound has two shared electron pairs, two bonds of sulphur with two hydrogen atoms.
The number of valence electrons on sulphur are six, out of these two are involved in bonding and rest four are in the form of two unshared (lone pair) pair of electrons
The answer is option e H₂S it has the same number of shared electron pairs as unshared electron pairs
