Bonding

Chemical Bonds These are the attractive forces that hold atoms together in a compound

Breaking a bond… Takes energy to overcome the attractive forces Therefore, breaking bonds is endothermic Energy + XY X + Y

Forming a bond… When a bond between two atoms is formed, energy is released. The bonded atoms are more stable together than they were alone. Therefore, forming bonds is exothermic X + Y XY + energy

Lewis Dot Structure (also called electron dot diagrams), show only the VALENCE e- in an atom. For bonding, only the valence e- are important. One dot = 1 e-

Lewis Dot Structures Since an atom can only have a max of 8 valence e-, we will never need more than 8 dots One dot = 1 e-

To show an atoms valence e- imagine a “box” around the atom’s symbol: Since Neon has 8 valence e-, it will have 8 dots, 2 on each “side”