Across
- 1. the positively charged particles in the nucleus of an atom
- 4. the number of protons in the nucleus of one atom of the element
- 7. a chart that organizes elements by their properties
- 8. a column in the periodic table
- 9. the negatively charged particles that circle the nucleus of an atom
- 10. the ways an element behaves with other elements
- 12. the center part of an atom, which contains protons and neutrons
- 13. change chemically
- 14. giving off high-energy particles
- 16. imaginary paths around the nucleus of an atom in which electrons move
- 17. balanced and not easy to change
- 20. having qualities that set one thing apart from others
Down
- 1. the characteristics of a substance you can observe without changing the substance
- 2. people who find new ways to use elements and compounds
- 3. the smallest part of an element that has the properties of that element
- 5. events that happen over and over
- 6. a row in the periodic table
- 10. a change in matter that results in the formation of a new substance
- 11. an abbreviation for an element, usually made of one or two letters from the beginning of its name
- 15. a substance that cannot be split into simpler substances
- 18. materials that allow heat and electricity to pass through
- 19. any substance from which something can be made
- 20. the mass per unit volume of a substance