Across
- 3. name of the columns of the elements
- 7. the lightest weight metalloids
- 9. negatively charged ions
- 11. has the atomic mass number 24
- 12. state of the matter of element calcium
- 13. the heaviest metal on the chart
- 14. the name of the element with the symbol "w"
- 15. which element is the number 12 on the periodic table
- 17. most of the chemical elements on the periodic table
- 19. surname of who arrange the known elements in order of decreasing mass
- 20. a gas with 8 protons and 8 neutrons
Down
- 1. to which element group does argon belong
- 2. what is the "ar" symbol for
- 4. which element is the number 14 on the periodic table
- 5. most metallic element
- 6. the central part of the atom
- 8. first chemical element on the periodic table
- 10. the only element in the halide family that is liquid
- 16. surname of inventor of the modern periodic table
- 18. most conductive metal element