Periodic Table divisions:

• The Periodic Table is divided into groups and periods.

• Groups run up and down.

• Periods run side to side.

• REMEMBER: "The groups! The groups! The groups are in columns! The rows! The rows! The rows are periods!

Classifying Matter

• Elements: pure substances, on the Periodic Table

• Compounds: two or more elements; parts on the Periodic Table

• Mixtures: two or more substances MIXED; not on Periodic Table

Periodic Table Groups:

• Groups are also called "families"

• REMEMBER*: Groups are in "columns!"

• Groups share common characteristics; i.e. All group 1 elements explode in water. All group 18 elements DON'T react.

• Fluorine and Chlorine are in the same GROUP (17), SO, they share the same PROPERTIES.

Groups & Periods

• Groups: Columns; up & down, similar properties. ⬆️ ⬇️

• Periods: Rows; left to right; increasing atomic ➡️ ⬅️

Periodic Table Periods:

• Periods run in rows.

• Each period has the same number of electron shells. i.e. Hydrogen and Helium have 1 electron shell. Lithium and Boron have 2.

• This means each period has the same number of ENERGY LEVELS!

Metals, Metalloids, and Nonmetals

• The periodic table is divided into 3 types of chemicals

• They are in alphabetical order: 1. Metal, 2. Metalloid, 3. Nonmetal

• Metals are the largest group

• Metalloids are the smallest group between metals and nonmetals.

Reactivity

• ability of a substance to react

• decreases left ➡️ to right ⬅️

• Group 1 and 17 are the most reactive

• Group 18 Noble Gases are least reactive, stable

Metals

• Metals are on the left side of the table.

• Characteristics include: malleable, ductile, shiny, and conductive (electricity and heat)

Metalloids

• Metalloids are on the stairstep between metals and nonmetals.

• Characteristics include: somewhat malleable, a little ductile, somewhat shiny, and conductive at high temperatures

Nonmetals

• Nonmetals are on the right side of the table.

• Dull, brittle, non-conductors

Metals, Nonmetals, Metalloids

• Metals: ductile, malleable, luster, solids

• Metalloids: properties of metals & nonmetals

• Nonmetals: brittle & dull