• Horizontal groups

• Same properties in common

• Count up by 1 per element

Period

• ​Verticle groupings

• Tells how many valence electrons are in each element (using the ones pace) in the TALL groups

​​Groups

• Outter-most level of the electron cloud

• This is different in each group of the periodic table

• Different levels hold different amounts of electrons

Valence Electrons

• Refers ONLY to the valence electron level

• 8 valence electrons = stable

• Easier to empty the Valence electron level with fewer electrons

• Easier to fill a valence electron level with more electrons

​

Octet Rule

Write the symbol in the middle

Step 1

Use your periodic table to find how many valence electrons the element has

​​Step 2

​Draw 1 dot on each side of the symbol (4)

It doesn't matter which side you choose

Step 3

Pair up any dots that are left over

​​Step 4

​Lewis Dot structures How To:
Complete this for the Notes on page 50

Set of letters and numbers that represent a compound
(Compound- 2 + elements bonded together)

​​Parenthesis = Multiplication

Subscript- the small number below the letters of an element
Tells how many of THAT atom are in a compound

How to read:

​Chemical Formula- write in Notes page 50

​​Chemical Formula

Original Chemical Formula- Mg(NO₃)₂

What it looks like-
Mg NOOO NOOO

Totals:
Mg= 1 N= 2 O= 6