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