Max’s crossword puzzle

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Across
  1. 6. earth metal, they are all shiny, silvery-white, somewhat reactive metals
  2. 11. Particles with an electrical charge of positive 1
  3. 12. atomic number 5
  4. 13. gas, any of the gaseous elements
  5. 14. the center of an atom made up of protons and neutrons
  6. 15. atomic number 2
  7. 16. reactive nonmetallic elements
  8. 19. an element that has properties of both a metal and nonmetal
  9. 21. Particles with an electric charge of negative 1
  10. 22. Na
  11. 23. Neutral particles that do not have an electrical charge
  12. 24. Together with hydrogen they constitute group 1
Down
  1. 1. C
  2. 2. This group is also known as the oxygen family
  3. 3. atomic number 1
  4. 4. Sn
  5. 5. the elemnts that are usually poor conductors of heat and electricity
  6. 7. N
  7. 8. Fe
  8. 9. number, the number of protons in the nucleus of an atom
  9. 10. the elements thta are good conductors of heat and electricity
  10. 17. a horizontal row of elements in the periodic table
  11. 18. a vertical column of elements in the periodic table
  12. 20. an atom or a group of atoms that has lost or gained one or more electrons
  13. 25. the smallest particle that has the properties of an element