Across
- 3. atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties
- 7. negatively charged particle
- 9. elements found in Group 1A of the periodic table
- 10. column of elements in the periodic table
- 12. elements found in Group 8A of the periodic table
- 14. positively charged particle
- 15. alkali metal that belongs to the sixth period
- 18. nonmetals form into these type of ions
- 20. row of elements in the periodic table
Down
- 1. who first published the classification of the elements in the periodic table
- 2. number of protons in the nucleus of an atom
- 4. elements found in Group 2A of the periodic table
- 5. A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions
- 6. neutrally charged particle
- 8. metals form into these type of ions
- 11. elements found in Group 7A of the periodic table
- 13. poor conductors of heat and electricity, and are not malleable or ductile
- 16. atom or molecule with net electric charge due to the loss or gain of electrons
- 17. average mass of the elements isotopes
- 19. positively charged region at the center of the atom