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Disodium phosphate is an ionic compound, not a covalent one. It consists of positively charged sodium ions and negatively charged phosphate ions, which are held together by electrostatic attractions.
tricalcium phosphate is an ionic compound do to the fact that it is the bonding of a metal and a nonmetal. it is usually only a molecular compound if it is a bond between two nonmetals such as oxygen and hydrogen.
Short answer both ionic and covalent! The bond between the sodium (metal) and phosphate (PO43-) (nonmetal) is ionic. The bonds between the phosphorous (nonmetal) and the oxygen (nonmetal) atoms are all covalent. The trick is to treat a covalent compound (PO43-, CO32-, etc) as grouped together when balancing charges, looking for ionic bonds, etc.
Ammonium phosphate is an ionic compound. It is formed through the combination of the ammonium ion (NH4+) and the phosphate ion (PO43-), which are both charged species that form an ionic bond.
Ionic =) ================== You might think the bonds are ionic if you believe the misconception that all metal-nonmetal compounds contain ions, and are thus "ionic." The bonds in Na3P have only 33% ionic character, meaning the bonds have much greater covalent character than ionic character. There are no 100% ionic bonds, and in Na3P there are no Na+ ions nor P^3- ions. Nor are P^3- ions produced when Na3P reacts with water. Phosphine gas is liberated from a solution of sodium hydroxide. The reaction is very exothermic. Na3P(s) + 3HOH(l) --> 3NaOH(aq) + PH3(g) --- Pisgahchemist
ICl3 has covalent bonds, N2O has covalent bonds, and LiCl has ionic bonds.