Across
- 3. the smallest particle that has the properties of an element
- 5. a negatively charged subatomic particle
- 10. number the number of protons in the nucleus of an atom
- 11. family group 1A
- 12. the elements that are good conductors of heat and electricity
- 14. an ion with a positive charge
- 18. electron an electron in the outermost energy level of an atom
- 19. another name for period
- 20. level any of the possible energies an electron may have in an atom
- 21. the process of adding electrons to or removing electrons from an atom
- 23. a positively charged subatomic particle
- 24. a neutral subatomic particle
- 26. the center of an atom
Down
- 1. number the total number of protons and neutrons in the nucleus of an atom
- 2. gas family group 8A
- 4. the elemnts that are usually poor conductors of heat and electricity
- 6. family group 6A
- 7. family group 7A
- 8. an element that has properties of both a metal and nonmetal
- 9. another name for metalloid
- 13. earth metal family group 2A
- 15. another name for group
- 16. a vertical column of elements in the periodic table
- 17. a horizontal row of elements in the periodic table
- 22. any atoms having the same number of protons but a different number of neutrons
- 25. an ion with a negative charge