Atomic combinations: molecular structure

• Chemical Bond


  mutual attraction between two atoms resulting from the simultaneous attraction between their nuclei and the outer electrons
• Covalent Bond


  the sharing of electrons between two atoms to form a molecule
• Molecule


  A group of two or more atoms covalently bonded and that function as a unit.
• Difference Between Compound and Molecule

  A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. All molecules are not compounds. All compounds are molecules.
• Bonding Pair


  pair of electrons that is shared between two atoms in a covalent bond
• Lone Pair (unshared pair)


  pair of electrons in the valence shell of an atom that is not shared with another
• Electronegativity


  measure of the tendency of an atom in a molecule to attract bonding electrons
• Non-Polar Covalent Bond


  a bond in which the electron density is shared equally between the two atoms
• Polar Covalent Bond


  a bond in which the electron density is shared unequally between
• Bond Energy of a Compound

  energy needed to break one mole of its molecules into separate atoms
• Bond Length

  the average distance between the nuclei of two bonded atoms.