PARTICLES

3. A group of atoms chemically bonded, like oxygen or water
5. A state of matter with no fixed shape or volume
7. A state of matter that flows and adapts to its container’s shape
8. The ancient Greek philosopher who proposed matter consists of indivisible atoms
10. A pure substance containing only one type of atom
12. The Greek thinker who argued matter was a continuous substance
13. The random movement of particles suspended in a fluid, explained by molecular collisions (8,6)
16. A positively charged particle found in an atom’s nucleus
17. The chemical link holding atoms together in a molecule

1. A variant of an element with a different number of neutrons
2. A substance formed by different elements chemically combined
4. A state of matter with a rigid structure and fixed volume
6. The force binding atoms into molecules
9. The smallest unit of an element that retains its properties
11. A negatively charged particle orbiting an atom’s nucleus
14. The physical substance that occupies space and has mass, existing in various states
15. A neutral particle within an atom’s nucleus