2. Practice: True or False
All molecular compounds are composed of atoms of two or more elements.
All compounds are molecules.
No elements exist as molecules
Molecular compounds are composed of two or more nonmetals.
Atoms in molecular compounds share electrons.
Ionic compounds lower melting and boiling points than molecular compounds.
F –Some molecular compounds are composed of the same elememtn…. Super 7
False – Ionic compounds are not moleculares
False- Super 7. diatomic elements
All Molecular compounds are composed of non-metals
True. Covalent –share, ionic-transfer electrons
FALSE- ionic compounds have higher melting and boiling points

4. Page 256 39. Ionic because high melting point.
41. molecules: nitrogen, oxygen. Argon monoatomic.
43. b, c, e.
45a. Ionic b. ionic c. covalent d. covalent
46. Ionic bonds form from a transfer of electrons and depend on electrostatic attraction between ions. Covalent bonds form from the sharing of electrons and depend on electrostatic attraction between share electrons and nuclei of combining atoms.