Alkali Metals – Group 1 (e.g., Lithium, Sodium)Alkaline Earth Metals – Group 2 (e.g., Calcium, Magnesium)Transition Metals – Groups 3–12Metalloids – Borderline elements (e.g., Boron, Silicon)Non-Metals – Right side of the periodic table (e.g., Oxygen, Nitrogen)Halogens – Group 17Noble Gases – Group 18 (e.g., Helium, Neon)Lanthanides – Elements 57–71Actinides – Elements 89–103Metals – Most elements on the left and center of the table