Question

in 1976, the american chemical society recognized tin(ii) fluoride toothpaste as one of the greatest discoveries in the past 100 years. tin(ii) fluoride contains the cation sn²⁺. stannous fluoride in toothpaste helps protect teeth from cavities. which of the following is the correct lewis diagram for the sn²⁺ cation? choose 1 answer: a sn ²⁺ b :sn: ²⁺ c :sn:⁻ ²⁺

Explanation:

Step1: Recall Lewis - diagram rules for ions

Lewis diagrams for cations show the symbol of the element in brackets with the charge outside. For a simple cation like $\text{Sn}^{2 + }$, we just write the symbol of tin ($\text{Sn}$) in brackets and the $2+$ charge outside. There are no valence - electrons to show as two electrons have been lost to form the cation.

Answer:

A. $[\text{Sn}]^{2 + }$