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Example: iron(iii)oxide

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are how you combine the elements (example, one chlorine ion for every one sodium ion)

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A anion is an ion with a negative , a cation is an ion with a positive charge

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A charge is depended by how many electrons one element gains or gets, electrons have a negative charge (protons have positive, nuetrons have a neutral charge).

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An example of an ionic compound is NaCl (salt)

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elements can loose/gain valence electrons to make themselves or another element stable

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Elements need 8 valence electrons to be stable

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elements and ions contain electrons, protons, and nutrons. The electrons on the outermost shell are called Valence electrons

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Are groups 3-12 on the periodic table, they are significant because they can choose how many valence electrons they give.

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There are 18 different groups, and seven different periods. Groups are columns, and periods are rows

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which are sorted into 3 categories