Is NH43PO4 Ionic or CovalentMolecular

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To tell if (NH4)3PO4, Ammonium phosphate, is ionic or covalent (also called molecular) we we need to recognize NH4 + is a polyatomic ion and has a charge of 1+. The 1+ charge applies to the entire Ammonium ion. • The PO4 3- is also a polyatomic and made of a group of non-metals and has an overall ionic charge of 3-. When we have a the polyatomic ion NH4+ and another polyatomic ion the compound is considered ionic. • Because the NH4 + and PO4 3- have opposite ionic charges they attract and form an ionic bond. So in answer to our question (NH4)3PO4 is an ionic compound. Do note that the bonds in each polyatomic ion are covalent since they consist of only non-metals. But the overall compound, (NH4)3PO4 is an ionic compound. • --- • Helpful Resources • Metals, Non-Metals on the P- Table: • Metals, Nonmetals, and Metalloids on ... • Ionic, Covalent, Polar Covalent: • Polar, Non-Polar, and Ionic Compounds... • Electronegativity for each element: https://en.wikipedia.org/wiki/Electro... • Memorizing Polyatomic Ions: • Memorizing and Using the List of Poly... • Finding Ionic Charge: • Figuring out the Charge on Ions • --- • In general, ionic compounds: • form crystals. • have high melting points and boiling points. • are hard and brittle. • conduct electricity when dissolved in water. • as solids do not conduct electricity. • For more chemistry help, see http://www.Breslyn.org.

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