Ion - Wikipedia
Ions consisting of only a single atom are termed atomic or monatomic ions, while two or more atoms form molecular ions or polyatomic ions. In the case of physical ionization in a fluid (gas or liquid), "ion pairs" are created by spontaneous molecule collisions, where each generated pair consists of a free electron and a positive ion. [5]
Ion | Definition, Chemistry, Examples, & Facts | Britannica
2024年11月6日 · 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. Ions migrate under the influence of an electrical field and are the conductors of electric current in electrolytic cells.
Ion Definition - What is an Ion? (Detailed Explanation with FAQs)
What is an Ion? An ion can be defined as a chemical species which holds a positive or negative charge of some magnitude. The term ‘ion’ can be used to refer to atoms or molecules that have non-zero net charges associated with them.
What Is an Ion? Definition and Examples - ThoughtCo
2019年9月4日 · An ion is defined as an atom or molecule that has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species.
6.1: Ions - Chemistry LibreTexts
2022年7月21日 · An atom that picks up a charge by gaining or losing electrons is called an ion. In this section we will focus on monatomic ions: ions formed from a single atom. Later in this chapter we will look at a second type of ion called a polyatomic ion; these form when a group of bonded atoms collectively gain a charge.
4.9: Ion Formation - Chemistry LibreTexts
2023年4月17日 · An atom that has gained or lost one or more electrons is called an ion. An ion always has a charge that is positive (+) or negative (−). An ion with a positive charge is called a cation, while an ion with a negative charge is called an anion.
What Is an Ion? Chemistry Definition - Science Notes and Projects
2021年11月20日 · In chemistry, the definition of an ion is an electrically charged atom or molecule. This means the atom or molecule has an unequal number of protons and electrons. Neutrons carry no net electrical charge, so they don’t affect ions directly. In chemical reactions, ions form when atoms or molecules gain or lose valence electrons.
Atoms, isotopes and ions - AQA Ions - BBC
Atoms are made up of protons, neutrons and electrons. Change the number of neutrons in an atom and it becomes an isotope, change the number of electrons, it becomes an ion. Normally, atoms are...
3.3: Types of ions - Chemistry LibreTexts
Magnesium and nitrogen react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them. Solution. Magnesium’s position in the periodic table (group 2) tells us that it is a metal. Metals form positive ions (cations).
Monatomic Ion Definition and Examples - Science Notes and …
2021年7月13日 · Atoms naturally form monatomic ions during chemical reactions, when ionic compounds melt, and when electrolytes dissociate in water. For example, NaCl forms the monatomic ions Na + and Cl- when it dissolves in water. Atoms form this monatomic ions so they have the most stable electron configuration.