A pure substance made of positive and negative ions in a fixed ratio is called an ionic compound. Ionic compounds are formed when metal atoms transfer electrons to nonmetal atoms, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions). These ions are held together by strong electrostatic forces of attraction in a regular, repeating lattice structure. Common examples of ionic compounds include sodium chloride (NaCl) and magnesium oxide (MgO).
What is a pure substance made of positive and negative ions in a fixed ratio called?
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