part iv. new area of focus: periodic table of the elements. new area of focus: periodic table of the...

Part IV

New Area of Focus: Periodic Table of New Area of Focus: Periodic Table of the Elements.the Elements.

• Questions– Which were missing? How do you know?

• Questions– Which were missing? How do you know?– How is the periodic table similar to the

arrangements of cards?

• Questions– Which were missing? How do you know?– How is the periodic table similar to the

arrangements of cards?

• Questions– Which were missing? How do you know?

• Questions– Which were missing? How do you know?– 5, J, 2, 6, 7, 7, J, 3

– The Periodic Table increases in amu from left to right.

– Rows show the same number of valence E-

• Answer! – The Periodic Table increases in amu from left

to right.– Columns show the same number of valence

Electrons

• Answer! – The Periodic Table increases in amu from left

to right.– Columns show the same number of valence

E-

The table puts elements into groups The table puts elements into groups with similar characteristics.with similar characteristics.

The table puts elements into groups The table puts elements into groups with similar characteristics.with similar characteristics.

• All of the elements in a period have the same number of atomic orbitals.

Valence Electrons

• The number of electrons in the outer shell of an atom

• Hydrogen has one valence electron; its in the Alkali Metal Family

• All other elements in this family, Li, Na, K, Rb, and Cs, also have only one valence electron.

• Fluorine has seven valence electrons

• This places it in the halogen family

Pronounce the names of all the elements on the Periodic Table. You have 1 minute and 25 seconds! Go!

• Video song! Tom Lehrers (1:25 seconds)

• http://www.youtube.com/watch?v=DYW50F42ss8

• Video song! Tom Lehrers

• http://www.youtube.com/watch?v=nHUo0lG8Gi0

Horizontal row is called Period Horizontal row is called Period

Horizontal row is called Period Horizontal row is called Period (Same # of electron orbitals)(Same # of electron orbitals)

Vertical column is called group/family. Vertical column is called group/family.

Vertical column is called group/family. Vertical column is called group/family. (Same # of valence electrons) (Same # of valence electrons)

Vertical column is called group/family. Vertical column is called group/family. (Same # of valence electrons) (Same # of valence electrons)

• Is the circled area a period or group on the periodic table?

• Is the circled area a period or group on the periodic table? Answer: Group

AMU increases from left to right and AMU increases from left to right and top to bottom.top to bottom.

AMU increases from left to right and AMU increases from left to right and top to bottom.top to bottom.

Documents