Across
- 3. This scientist organized the periodic table by atomic number.
- 7. A negatively charged particle.
- 10. An atom that has gained electrons and has a negative charge.
- 12. A positively charged particle.
- 13. This type of element conducts electricity, has luster, and is malleable.
- 15. The type of metal that makes up the d orbital.
- 16. The most reactive nonmetal group.
- 18. The most reactive metal group.
- 19. The name of the rows on the periodic table.
- 20. The ability of an atom to attract electrons.
Down
- 1. The ability of an element to undergo a chemical change.
- 2. This scientist discovered the relationship between chemical and physical properties of elements and atomic mass.
- 3. This type of element has properties of both metals and nonmetals.
- 4. These elements make up the last row of the periodic table.
- 5. This type of electron is in the outermost energy level of an atom.
- 6. This type of element does not conduct electricity well, is dull, and brittle.
- 8. These elements make up the second to last row of the periodic table.
- 9. These gases are the most stable, containing 8 valence electrons.
- 11. This type of energy is the amount of energy required to remove a valence electron from an atom.
- 14. This scientist moved the lanthanides and actinides below the periodic table.
- 17. An atom that has lost electrons and has a positive charge.
- 21. The name of the columns on the periodic table.