For each of the following ions, indicate the number of...

For each of the following ions, indicate the number of protons and electrons the ion contains.
a. $\mathrm{Ba}^{2+}$
b. $\mathrm{Zn}^{2+}$
c. $\mathrm{N}^{3-}$
d. $\mathrm{Rb}^{+}$
e. $\mathrm{Co}^{3+}$
f. $\mathrm{Te}^{2-}$
g. $\mathrm{Br}^{-}$

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Key Concepts

Atomic Number

The atomic number of an element represents the number of protons in the nucleus of an atom. It uniquely identifies the element and, in a neutral atom, is equal to the number of electrons.

Ion Formation and Charge

Ions are atoms or molecules that have gained or lost electrons, resulting in a net electrical charge. When an atom loses electrons, it becomes a positively charged ion (cation), and when it gains electrons, it becomes a negatively charged ion (anion).

Electron Count Calculation

The electron count in an ion is determined by adjusting the number of electrons in the neutral atom (which equals the atomic number) by the ion's charge. For a cation, electrons are subtracted from the atomic number, and for an anion, electrons are added.

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