Question

Tem

AP Callingboard
The electron-dot structure (Lewis structure) for which of the following molecules would have two unshared pai
electrons on the central atom?
(A)) H₂S
(B) NH3
(C) CH4
(D) HCN
(E) CO₂

Answer 1

The molecule with two unshared pair of electrons on the central atom is NH3.

Step-by-step explanation:

The molecule with two unshared pair of electrons on the central atom in its electron-dot structure is NH3, or ammonia. In NH3, the central atom is nitrogen (N) and it is surrounded by three hydrogen (H) atoms. Nitrogen has five valence electrons, and each hydrogen atom contributes one valence electron, making a total of 8 valence electrons. Two of the eight valence electrons are shared with hydrogen atoms, and the remaining six electrons form two unshared pairs on nitrogen.

Learn more about Electron-dot structure