Mendeleev

Created the first version of the periodic table

First P.T

Periodic Table1 2

3 4 5 6

•Elements arranged on a periodic table by their atomic numbers

7 8

Periodic Table

Period Tells the number of energy levels

Fam

ily

Tells the number of outermost electrons

# of outermost electrons

1 2 3 4 5 6 7 8

The Periodic Table - Groups

Families are the ColumnsElements in the same Family:- have similar chemical properties- have the same # of valence

electrons (Valence electrons = the outermost electrons in an atom)

P Table : FamiliesHeads Up! Families often called Groups - A-OK

All elements with “A” in family number are in a group called Representative Elements

Representative elements exhibit wide variety of physical and chemical properties

Ptable: Periods

Periods are the ROWSThe period number = the number of energy levels occupied by the element’s electronsTells the number of energy levels in elementSodium, Magnesium and Aluminum all have electrons in the 3rd energy level

What are the colors about?

• The Colors indicate classes of elements that have similar properties.

• Determined by electron configuration and behavior during chemical reactions.

What are the colors about?Metals:

Alkali, Earth and Transition

• Solid at room temp (ex Hg)

• Malleable• Conduct

electricity• Shiny

appearance

What are the colors about?Metals:

Alkali, Earth and Transition

• Alkali make compounds with halogens

What are the colors about?Metals:

Alkali, Earth and Transition

• Will generally LOSE electrons during chemical reactions

What are the colors about?

Transition Metals

+

Inner Transition Metals

These classes will behave like metals, but in more varied manner

Will lose different numbers of electrons depending on what they are reacting with

What are the colors about?Non metals:

(including halogens and noble gases)

• Poor conductors of electricity

• gas or brittle solids at room temp

What are the colors about?Non metals:

(including halogens and noble gases)

• Generally gain electrons during chem rxns (except for noble gases)

What are the colors about?Metalloids:

Elements with properties between metals and non-metals

What are the colors about?

Halogens:

Exist in all 3 states of matter

Will make compounds with Alkali metals

What are the colors about?

Noble Gases: Elements that have full outermost electron energy levels

Inert – Are not involved in chemical reactions

How Stuff Works: Neon Signs

The period 7 elements

Many period 7 elements have not been found in nature.

Are made in labs or theoretically exist only.

Usually radioactive.