Across
- 3. something every humans use
- 5. any of various metallic elements
- 10. the number of protons in the nucleus of an atom
- 12. a substance that is in a gaseous, or vaporous, state of matter
- 14. is the first element on the periodic table
- 17. any of the strongly basic metals
- 19. an unstable form of elements in an atomic nucleus with an excess nuclear charge
- 20. a chart of chemical elements organized by atomic number
- 22. any of a group of rare gases
Down
- 1. a one or two letter symbol that represents the element
- 2. elements with atomic numbers 58-71
- 4. is a substance where the particles are still close together, but not as tightly bonded
- 6. shiny metals with low melting points
- 7. there are families which are groups of elements with similar properties.
- 8. The main elements of nature for life on earth
- 9. poor conductors of heat and electricity
- 11. they touch the bold step-shaped line in periodic table
- 13. the number assigned to the vertical columns of the periodic table
- 15. constructed into elements by humans
- 16. is the sixth period and third group of the periodic table
- 18. a state of matter that is in a firm
- 21. is a substance that is in a gaseous, or vaporous, state of matter