History of the Periodic Table
Across
- 3. rayleigh Discovered Argon which led to the creation of Noble Gasses
- 6. Proved Mendeleev's arrangement of the periodic table to be correct. Arranged the periodic table by atomic number, not mass.
- 8. weight Increases as you move down a group
- 9. Arranged Horizontaly
- 11. and actinides Added last to the periodic table
- 12. periodic law States that when elements are arranged in order of increasing atomic number, their physical and chemical properties show a pattern.
- 13. Exist in between the distinctions of metals and nonmetals.
- 16. Not able to conduct electricity or heat very well.
- 17. Arranged Verticaly
- 20. Highly conducive to both heat and electricity.
Down
- 1. In 1894 the _____ Gasses were discovered
- 2. believed all substances were made of small amounts of earth, air, water, and fire.
- 4. The _____ Periodic Table has its elements arranged in order of atomic number.
- 5. Arranged first periodic table according to atomic mass.
- 7. Defined an element as a fundamental substance.
- 10. Determined a method for accurately measuring the relative masses of atoms.
- 14. Scientists who worked on configuring the Periodic Table
- 15. Created a scale of atomic weight
- 18. Placed the noble gasses in their own group
- 19. In 1913 the periodic table was arranged by ____