Atomic Structure and Periodic Table

Lanthanide and Actinide Series

● Located under the periodic table, but they actually

belong in periods 6 and 7

● Lanthanides - period 6
● Actinides - period 7

Lanthanides

Actinides

Expanded periodic table

Why are lanthanides and actinides on the bottom?
So it's easier to fit the periodic table on piece of paper

LANTHANIDES

ACTINIDES

1. Metals

2. Metalloids

3. Nonmetals

Elements are organized into 3 classifications.

Label your periodic table (use arrows for metals and nonmetals, lightly shade metalloids)

1. Left side of stairs:

metals

2. Right side of stairs:

nonmetals

3. Touching the stair:

metalloids (B, Si,
Ge, As, Sb, Te, Po?, At?)

Not Aluminum!

METALS

Nonmetals

Metalloids

• These are the number of electrons found on the outermost energy level

• If you are still confused about valence electrons, watch the 4-minute video which will explain more about valence electrons. You will need to copy and paste the link into another browser tab.

• https://www.youtube.com/watch?v=0hsh0VoFsts

Groups are the vertical columns within a periodic table. All elements in the same group will have the same number of valence electrons.