Ionic Compounds: Between metal and nonmetal or polyatomic ion, ammonium sulphate, electrons are transferred between atoms, no prefixes in naming, Roman numeral charges for transition metals, polyatomic ion name never changes in naminge, sodium phospide, iron (III) chloride is FeCl3, held together by electrostatic forces, does not exist as individual formula units, exists in a crystal lattice, Covalent Compounds: between nonmetals/metalloids, carbon dioxide, electrons are shared between atoms, but not always equally, no mono- on first element in naming, all prefixes on naming second element, nitric acid, tetraphosphorous decoxide is P4O10, sulfur hexafluoride is SF6, held together by attraction of electrons to each other's nuclei, hydrobromic acid is HBr, exists as individual molecules, formula shows actual numbers of each atom in 1 molecule, Not Correct for Either Ionic or Covalent: nonmetal name is first, followed by metal name, between metal and metalloid, CaF2 is calcium (II) fluoride , CO is monocarbon monoxide, MgCO3 is magnesium monocarbon trioxide, PbBr4 is lead bromide, H2SO4 is sulfurous acid,

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