The Periodic Table

8th Grade

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Dmitri Mendeleev

Discovered that patterns appeared when elements were arranged in order of increasing atomic mass.

He published the first periodic table.

Periodic Table

Made up of elementsArranged 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.

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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.

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METALSElements on the LEFT

side of the periodic table; have a shiny surface and are good conductors of electricity

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NON METALS

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

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METALLOIDS

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

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

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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.

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