1. Periodic table Groups and periods
Groups are the vertical columns in the PT.
There are 18 groups
Periods are the horizontal row in the PT.
There are 7 periods
Metals, nonmetals, metalloids and noble gases.

2. Metals Located on the left side of the zigzag line on the PT
They have silvery luster
They are malleable (become sheets)
They are ductile (become wire)
They are good conductors of heat and electricity
Solid except for mercury (Hg)

3. Non Metals They are located on the right side of the zigzag
They are brittle
Poor conductors of heat and electricity
Solid, liquid and gas

4. Metalloids They are found on the zigzag line
They have properties of metals and non metals
Use widely as superconductors, computers, etc

5. Noble gases Also called INERT GASES Located in group 18
All of them are gases!!!
They are unreactive (except Xe reacts - F)