Problem: 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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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.


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Problem Details

Cations are shown primarily at the left side of the table, in groups 1A, 2A. The transitional metals at the center of the table separate these cations from the last cation shown (Al3+) on group 3A, on the border of the red stepped line that separates the cations from the anions. The anions are found in groups 5A to 7A, with 7A bordering the noble gases in (group 8A). The common ions are described as follows. Group 1A are cations that include the symbols H +, Li +, K +, Rb +, and Cs +. Group 2A are cations that include the symbols Mg 2+, Ca 2+, Sr 2+, and Ba 2+. Group 3A are cations that include the symbol Al 3+. Group 5A are anions that include the symbol N 3-. Group 6A are anions that include the symbols O 2-, S 2-, and Te 2-. Group 7A are cations that include the symbols H -, F -, Cl -, Br -, and I -.

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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