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An ion (/ ˈaɪ.ɒn, - ən /) [1] is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a …

Dec 26, 2025 · Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions.

So Na + is the sodium ion; Ca 2+ is the calcium ion. If the element has more than one possible charge, the value of the charge comes after the element name and before the word ion. Thus, Fe 2+ is the …

Jan 1, 2026 · Ions are atoms that have a positive or negative charge because they have unequal numbers of protons and electrons. If atoms lose electrons, they become positive ions, or cations. If …

Read this tutorial to learn about what an ion is, the differently charged ions, and how they are involved in different branches of chemistry!

5 days ago · An ion is an atom or a molecule that possesses a net electrical charge. Unlike a neutral atom, which has an equal number of protons and electrons, an ion has an imbalance between these …

An ion is an atom or a molecule that has a net electrical charge because its total number of electrons is not equal to its total number of protons. An ion is formed when a neutral atom loses or gains one or …

Apr 1, 2025 · In science, an "ion" is an atom or molecule that has gained or lost electrons, resulting in a net positive or negative charge. This definition is fundamental in understanding chemical reactions …

Sep 4, 2019 · Learn the definition of an ion, as used in chemistry, chemical engineering, and physics, plus review examples of ions.