Across
- 3. smallest unit of an element that keeps the properties of the element
- 5. elements that have properties of both metals and nonmetals
- 8. states that matter cannot be created or destroyed
- 10. made of two or more atoms
- 11. made of two or more different atoms
- 14. one group of elements that are unreactive
- 15. horizontal row of elements, tells you the number of shells
- 16. positively charged particle in the center of the atom
- 17. can have a chemical reaction with another substance
- 21. a mixture where one of the substances dissolves in the other, looks uniform
- 22. dense, positively center of an atom
Down
- 1. neutrally charged particle in the center of the atom
- 2. The electrons on the outermost shell of the atom
- 4. the amount of space an object takes up
- 6. easily set on fire
- 7. combination of 2 or more substances not chemically combined
- 9. the system of electrons surrounding the nucleus of an atom
- 12. Substance made of only one type of atom or only one type of molecule
- 13. measure of the amount of mass in a given volume
- 18. number number of protons in the nucleus
- 19. a charged particle that forms when an atom gains or loses one electrons
- 20. A vertical column on the Periodic Table of Elements