Practice Ion in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

An atom or group of atoms that has gained or lost one or more electrons, resulting in a net positive charge (cation) or net negative charge (anion). The number of protons remains unchanged; only the electron count changes.

An atom that's not neutral—it has more or fewer electrons than protons.

Example 1

easy
Sodium (Z = 11) loses one electron. Write the ion formed and its electron configuration.

Example 2

medium
An unknown ion has 10 electrons, 8 protons, and 8 neutrons. Identify the element, write the ion symbol, and calculate its charge.

Example 3

easy
Predict the ion formed by each: (a) calcium, (b) fluorine, (c) aluminum.

Example 4

medium
Aluminum loses 3 electrons. What ion forms, and why is its charge positive?
← Back to Ion Worked Examples