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