Ch. 19 Section 1 – Stability in Bonding 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: Subscript (written below): 2 means 2 atoms. 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