We’re being asked to determine the ion that has the same number of electrons as a number of a noble-gas element.
Before we can do that, let’s first determine the total number of electrons in a neutral silver, zinc, and scandium atoms by writing its electron configuration.
Predictable charges of some common ions. Notice that the red stepped line that divides metals from nonmetals also separates cations from anions. Hydrogen forms both 1+ and 1- ions.
The most common ions for silver, zinc, and scandium are Ag+, Zn2+, and Sc3+. Which of these ions have the same number of electrons as a noble-gas element?
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