8th Grade The Periodic Table

Dmitri Mendeleev Discovered that patterns appeared when elements were arranged in order of increasing atomic mass. He published the first periodic table.

Arranged by similar properties Periodic Table Made up of elements Arranged by similar properties

Groups or Families Vertical columns on the table – indicate # of valance electrons...number yours now! Elements have similar properties

Groups or Families (cont) Group 1-Alkali Metals Group 2 Alkaline Earth Metals Groups 3-12 Transition Metals Groups 13 -16 – Named by top element in each group

Groups (cont) Group 13-Boron Family Group 14-Carbon Family Group 15-Nitrogen Family Group 16-Oxygen Family Group 17 – Halogens Group 18 – Noble Gases

Periods Horizontal line of elements Arranged by number of electron energy levels Each period has the same number of shells. Text

Lithium (Period 2) – only valence electron shown Energy Level Example Lithium (Period 2) – only valence electron shown

Metals, Non Metals, & Metalloids Elements separated by zigzag line. Left of line are metals Right of line are non-metals Elements on either side of zigzag are metalloids.

METALS Elements on the LEFT side of the periodic table; have a shiny surface and are good conductors of electricity

NON METALS Elements on the RIGHT side of the periodic table; dull and are not good conductors of electricity

METALLOIDS Elements that are to the LEFT AND RIGHT of the zigzag line; have some characteristics of metal and non metal

Periodic Table Mini Quiz. you may use your notes Periodic Table Mini Quiz...you may use your notes. Directions: Get out paper and answer the following questions.

Answers!!! 1. Alkali metals 2. Cl, F, Br, I 3. Eight, except Helium which has only 2 valence electrons. 4. Number of valence electrons. 5. They are the same. 6. The number of shells. 7. Either side of the zigzag line on the periodic table. 8. To separate the metals from the nonmetals. Text