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Cations Ca t ion - positively charged ion (less electrons than protons)

Cations Ca t ion - positively charged ion (less electrons than protons) Ex: Lithium has 3 e - and is very reactive (1 e in valence) Removing one e - makes lithium less reactive It now has a full valence shell Lithium ion written as Li +

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Cations Ca t ion - positively charged ion (less electrons than protons)

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  1. Cations Cation - positively charged ion (less electrons than protons) Ex: Lithium has 3 e- and is very reactive (1 e in valence) Removing one e- makes lithium less reactive It now has a full valence shell Lithium ion written as Li+ It is not helium because we determine element by amount of protons (Helium has 2 e- like the Li + ion) It is not lithium…..it is a lithium ion!

  2. Naming a Cation: uses the name of the parent atom Ex: Na+ is called Sodium ion Mg2+ is called a magnesium ion (charge of +2)

  3. Anion – negatively charged ion (more electrons than protons) Ex: Fluorine has 9 e- and is reactive (7 e- in valence shell) Adding one e- makes fluorine less reactive because it now has a full valence shell Fluorine ion written as F - It is not neon (Ne has 8 e- like the F-ion) It is not fluorine ….it is a fluorine ion!

  4. Naming a Anion: use the root name of the atom and change the ending to have the suffix “ -ide” Ex: F - is called Fluoride ion I - is called an Iodide ion O 2- is called an oxide ion (charge of -2)

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