Across
- 4. Repeating patterns of properties across periods.
- 5. Group 2 metals; reactive; form +2 ions.
- 6. Weighted average mass of an element’s atoms.
- 8. Negatively charged ion (gain of electrons).
- 9. Horizontal row; properties change across as shells fill.
- 12. Atom or group of atoms with a net charge.
- 14. Pure substance made of only one kind of atom.
- 16. Group 18 gases; very unreactive and stable.
- 17. Atoms of the same element with different numbers of neutrons.
Down
- 1. Outermost electrons that drive bonding and reactivity.
- 2. Element with mixed metal and non-metal characteristics.
- 3. Central block metals; good conductors; typical metallic properties.
- 5. Group 1 metals; very reactive; form +1 ions.
- 7. Number of protons; defines the element.
- 10. Group 17 nonmetals; very reactive; form −1 ions.
- 11. Positively charged ion (loss of electrons).
- 13. Vertical column; elements share similar properties.
- 15. Smallest unit of matter that retains an element’s identity.