Answer and Explanation:
Metals are lustrous (shiny), malleable (that means that can be hammered) and ductile. They are usually solid at room temperature (except mercury which is liquid). They are good conductors of heat and electricity. They are made of metallic bonds. Examples: iron (Fe), silver (Ag).
Ionic compounds are hard and usually brittle. They form crystals (solid at room temperature) and they have high melting points. They only conduct electricity when are dissolved in water. They are made of ionic bonds Examples: sodium chloride (NaCl), magnesium oxide (MgO).
Molecular compounds are gases, liquids or low-melting solids. They are poor conductors of heat and electricity. They have low melting and boiling points. They are made of covalent bonds. For example: methane (CH₄) and ozone (O₃).
