Across
- 1. atom that has a charge because it has gained or lost electrons
- 3. substance made of two or more elements that are chemically joined in a specific combination
- 5. negatively charged particle
- 6. matter with a composition that is always the same
- 9. small particle that is the building block of matter
- 11. two or more atoms that are held together by chemical bonds and act as a unit
- 12. matter that can vary in composition
- 13. electrical property of some objects that determines whether the object is +, - or neutral
- 14. positively charged particle
Down
- 2. region at the center of an atom
- 4. one of two or more atoms of an element having the same number of protons but a different number of neutrons
- 7. uncharged particle in the nucleus of an atom
- 8. substance made of only one kind of atom
- 10. anything that has mass and takes up space