Chemical Bonds

1
Chemical Bonds

• Ch. 19
• Section 1 Stability in Bonding

2
Combined Elements

• Statue of Liberty

3
New properties

• The compounds formed when
• Example
• Sodium Chloride (table salt)

4
Formulas

• Chemical symbols
• Chemical formulas when 2 symbols are written
  together

5
Formulas show

• Example
• H2O
• 2 atoms of Hydrogen
• 1 atom of Oxygen
• Subscript (written below) 2 means 2 atoms.

6
What elements are in each, and how many atoms of
each?

• Mg(OH)2
• CaO
• HC2H3O2
• C2H5OH

7
Atomic Stability

• Atoms combine to make a compound that is
• Most elements

8
Noble Gases

• Atoms are considered chemically stable when

9
Energy Levels and other Elements

• Hydrogen
• Hydrogen is
• Either needs
• Li, Na, K, Rb, all have 1 electron
• Be, Mg, Ca, Sr, all have 2 electrons
• All want to combine with someone else

10
Outer levels getting their fill

• How do elements find or get rid of extra
  electrons?
• By combining with other elements
• Example Dot diagrams for NaCl

11
Stability is reached

• Chemical Bond
• Example
• H2O shares electrons instead of giving them away