- Group: A vertical column of elements in the periodic table.
- Period: A horizontal row of elements in the periodic table.
- Noble Gases: Group 18 (far right column).
- Alkali Metals: Group 1 (first column, excluding hydrogen).
- Halogens: Group 17 (second from right column).
- Alkali Earth Metals: Group 2 (second column).
- Transition Metals: Central block (Groups 3–12).
- Actinides: Bottom row (elements 89–103).
- Lanthanides: Second row from bottom (elements 57–71).
- Shaded region matching: Lightest shade → Non metals; Medium shade → Metalloids; Darkest shade → Metals.
Parent Tip: Review the logic above to help your child master the concept of periodic table of the elements worksheet.