Across
- 2. – A compound of a halogen with another element (6)
- 5. – Mass per unit volume of a substance (7)
- 8. – Soft, reactive metals in Group 1 of the periodic table (6,5)
- 9. – A horizontal row in the periodic table (6)
- 11. – A greenish-yellow halogen gas used as a disinfectant (8)
- 14. – A highly reactive alkali metal with the symbol Na (6)
- 15. – The smallest unit of a compound that retains its properties (8)
- 16. – When a gas turns into a liquid (12)
- 19. – The weighted average mass of an element's isotopes (6,6)
- 22. – A compound containing oxygen and another element (5)
- 23. – A vertical column in the periodic table (5)
- 24. – A positively charged particle in the nucleus of an atom (6)
- 25. – A pure substance made of only one type of atom (7)
- 27. – Group 17 elements like fluorine and bromine (7)
- 28. – The mass of an atom measured in atomic mass units (6,4)
- 30. – A substance that flows, like liquids and gases (5)
- 31. – When a liquid turns into a gas at its boiling point (7)
Down
- 1. – When a solid turns into a liquid (7)
- 3. – How easily an element or compound undergoes a chemical reaction (10)
- 4. – Describes particles in a solid that do not move freely (not fluid) (5,8)
- 6. – The total number of protons and neutrons in a nucleus (7,6)
- 7. – State of matter with no fixed shape or volume (3)
- 10. – The reverse process of melting (8)
- 12. – State of matter that flows and takes the shape of its container (6)
- 13. – The process where a solid turns directly into a gas (11)
- 16. – A substance formed when two or more elements chemically combine (8)
- 17. – The tendency of an atom to attract electrons (17)
- 18. – The region around an atom where electrons are found (8,5)
- 20. – The lightest and most abundant element in the universe (8)
- 21. – The process where a gas turns directly into a solid (10)
- 26. – State of matter with a definite shape and volume (5)
- 29. – The basic building block of matter (4)