Across
- 3. the number of protons in an atom's nucleus
- 9. group 18, generally very stable, colorless, and odorless
- 10. physical properties and appearances like metals, chemical properties like non-metals
- 13. able to be stretched into a thin wire
- 14. table of the chemical elements arranged in order of atomic number
- 15. average quantity of matter that an atom of that element contains
- 17. groups 3 through 12 and the lanthanides and actinides
- 18. vertical column of elements in the periodic table
- 19. the tendency of a substance to undergo chemical reaction by losing or gaining electron(s)
- 20. conduct heat and electricity, are shiny, and can be hammered into sheets or drawn into a wire
- 21. notation of one or two letters that represents a chemical element
- 22. 'fixer' of the periodic table, organised it by atomic number
Down
- 1. group 17 of the periodic table
- 2. horizontal row of the periodic table
- 3. the second group of the periodic table
- 4. able to be shaped or flattened into a thin sheet
- 5. another word for group
- 6. substance composed of atoms with different atomic numbers
- 7. first group of the periodic table
- 8. maker of the periodic table, but organised it by mass
- 11. the principle that the properties or characteristics of the elements recur periodically as their atomic numbers increase
- 12. substance composed of atoms with the same atomic number
- 16. determines the number of valence electrons
- 21. material that conducts heat or electricity
- 23. chemicals that do not conduct heat and electricity, are not shiny, and cannot be hammered into sheets or drawn into a wire