I love leanring

12345678910111213141516171819202122232425
Across
  1. 2. is total number of protons and neutrons in a atom
  2. 7. if an atom loses a electron then it becomes
  3. 8. have a positive charge
  4. 10. very reactive nonmetals
  5. 13. are rare earth elements
  6. 18. atoms produce energy and heat
  7. 20. the number of protons changes
  8. 22. when a electron is added
  9. 23. has no charge
  10. 24. element that conducts electricity and heat
  11. 25. the center of a atom
Down
  1. 1. less reactive earth metals
  2. 3. gas that never reacts with other elements
  3. 4. in rows on the periodic table
  4. 5. found in column
  5. 6. have properties of both metals and nonmetals
  6. 9. are very reactive
  7. 11. tell you how many protons a atom has
  8. 12. has a negative charge
  9. 14. shows all place that electrons would be
  10. 15. a series with 15 elements
  11. 16. same element but different mass
  12. 17. is the opposite of metal
  13. 19. same element but different number of electrons
  14. 21. generally less reactive