Molecular compounds are composed of molecules held together by covalent bonds where atoms share electrons. A molecule is a neutral group of atoms joined by covalent bonds, such as diatomic molecules consisting of two atoms of the same element like H2, N2, O2. Molecular compounds form between two nonmetals or a nonmetal and metalloid and have lower melting and boiling points than ionic compounds. They are often gases or liquids at room temperature and do not conduct electricity. Molecular formulas show the number of each type of atom in a molecule but not the molecular structure.
2. Molecules and Molecular Compounds Covalent bond Atoms held together by sharing electrons Molecule A neutral group of atoms joined together by covalent bonds Diatomic molecule A molecule consisting of two atoms of the same element H2, N2, O2, F2, Cl2, Br2, I2
3. Molecular compound A compound composed of molecules A covalent compound Formed between 2 nonmetals or a nonmetal and a metalloid Properties of molecular compounds Relatively lower melting and boiling points than ionic compounds Many are gases or liquids at room temperature Do not conduct electricity
5. Molecular Formulas Chemical formula of a molecular compound Shows how many atoms of each element a molecule contains Does not indicate the structure of a molecule Assignment Page 216 #1-6 Page 247 #39-41
