Presentation on theme: " Objective: To describe how atoms bond together to form compounds using valence electrons Journal: ◦ How many protons, neutrons and electrons are in."— Presentation transcript:
Objective: To describe how atoms bond together to form compounds using valence electrons Journal: ◦ How many protons, neutrons and electrons are in gold? ◦ Atomic # - 79 ◦ Atomic Weight - 197
When bonds form between atoms by either gaining or losing electrons ◦ Results in the compound having either a positive or negative charge
When an atom has an electrical charge it is called an ion ◦ If an atom gains an electron it has a negative charge ◦ If an atom loses an electron it has a positive charge
When bonds form between atoms by sharing valence electrons
When a hydrogen atom has a partial positive charge that is very strong it attracts to the negative charge of specific other molecules ◦ Oxygen, Nitrogen, Fluorine This is a very strong bond, but not as strong as a covalent bond.
Held together by covalent bonds Also has hydrogen bonds between water molecules
Hydrogen Bonding Allows For… Cohesion: water molecules stick together Adhesion: water molecules stick to other charged substances Surface Tension: water molecules resist an external force