Periodic Table Review

Dmitri Mendeleev

• Was the inventor of the periodic table
• Born February 8, 1834
• Had extensive knowledge about the elements
• However, he did not believe in the existence of atoms
• Organized table by atomic weight, not atomic number

Valence Electrons

• Electrons on the last outer shell of an atom
• Rule of Duet: First shell can only have 2 electrons
• Rule of Octet: All shells after the first can only have 8 electrons
• The first group has 1 valence electron, and the second has 2
• Groups 3-12 don't follow a pattern, 13-18 leave off where it ended

The Different Types of Elements

• Noble Gases & Halogens
• Alkali Metals & Alkaline Earth Metals
• Actinides & Lanthinides
• Transition Metals
• Metals, Nonmetals, Gases, Metalloids

Periodic Table Structure

• Alkali metals on far left of periodic table (not hydrogen)
• Alkaline Earth Metals are to the right of Alkali Metals
• Transition metals are in the middle box of the periodic table
• Noble gases on the far right of periodic table
• Halogens to the left of noble gases

Periodic Table Structure Contd.

• The metals, nonmetals, metalloids, and gases are
• between the noble gases and halogens
• The Lanthanides and Actinides are on the very bottom
• The top row is lanthanides
• The bottom row is actinides