Transcript Chemical Bonds

Chemical Bonds
Ch. 19
Section 1 – Stability in Bonding
Combined Elements
 Statue of Liberty




New properties
 The compounds formed when
 Example:
 Sodium Chloride (table salt)



Formulas
 Chemical symbols


 Chemical formulas: when 2 symbols
are written together

Formulas show:


 Example:
 H2O
 2 atoms of Hydrogen
 1 atom of Oxygen
 Subscript (written below): 2 means 2
atoms.
What elements are in each, and
how many atoms of each?
 Mg(OH)2
 CaO
 HC2H3O2
 C2H5OH
Atomic Stability
 Atoms combine to make a compound
that is
 Most elements
Noble Gases



 Atoms are considered chemically
stable when
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
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
Stability is reached
 Chemical Bond:
 Example :
 H2O shares electrons instead of giving them
away