Across
- 2. carbon-14 has a mass # of?
- 6. carbon-14 has this many neutrons?
- 9. this family has 7 valence electrons
- 10. transition metals have this many valence electrons
- 11. carbon has this many valence electrons
- 12. what rows on the periodic table are called
- 14. where electrons reside in the atom?
- 15. _____ metals are the most reactive metals on the periodic table
- 16. an isotope has the same # of protons but a different # of neutrons
- 18. negatively charged subatomic particle
- 20. negatively charged ion that gains electrons
- 21. ______ electrons reside in the outermost orbital
- 24. ______ number tells how many proton sin an element
- 25. nitrogen has this many electrons?
Down
- 1. to get the mass # you have to ______ the average atomic mass
- 3. positive center of the atom
- 4. neutral subatomic particle
- 5. ______ gases are in group 8A and are inert
- 7. groups or _______ are the columns on the periodic table
- 8. atomic # tells how many electrons in a neutral element
- 12. positively charged subatomic particle
- 13. # of neutrons in phosphorous
- 17. this element in period 2 forms an ion with a -2 charge
- 19. carbon-14 has this many protons?
- 22. positively charged ion that loses electrons
- 23. _____ number is equal to the protons + the neutrons in an element