Across
- 2. Another word for a group of elements that share similar chemical behaviors.
- 6. A predictable pattern of properties (like atomic size or electronegativity) across the periodic table.
- 8. Elements in Groups 3–12; often have variable charges and form colored compounds.
- 9. The lanthanides and actinides; found at the bottom of the periodic table, often used in electronics.
Down
- 1. Elements in Group 2; reactive metals like magnesium and calcium.
- 3. Elements in Group 1; very reactive metals like lithium and sodium.
- 4. Elements in Group 17; very reactive nonmetals like fluorine and chlorine.
- 5. A vertical column in the periodic table; elements in the same group have similar properties.
- 6. A horizontal row in the periodic table; properties change gradually across a period.
- 7. Elements in Group 18; stable, unreactive gases like helium and neon.