The Periodic Table and its Terms

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Across
  1. 2. the vertical column on the periodic table
  2. 3. how many electrons does carbon have
  3. 7. the smallest unit of matter that forms elements
  4. 9. pt is the chemical symbol for ___
  5. 14. what number is aluminium on the periodic table
  6. 15. discovered the neutron
  7. 17. what number is neon on the periodic table
  8. 21. developed the idea of atoms
  9. 24. a collection of protons and is always in the centre of the atom
  10. 25. re is the chemical symbol for ___
  11. 26. what does the formula H2O belong to
  12. 27. what number is chlorine on the periodic table
  13. 30. how many groups are there
  14. 32. a subatomic particle with a neutral charge and a mass higher than a proton
  15. 33. a group in the periodic table consisting of five chemically related elements
  16. 34. what number is zirconium on the periodic table
  17. 36. what is hydrogen’s atomic number
  18. 37. a material made up of two or more different substances combined physically but not chemically
  19. 39. the horizontal columns on the periodic table
  20. 40. how many neutrons does beryllium have
Down
  1. 1. a type of matter with uniform properties
  2. 4. a group of atoms bonded together to make up an element
  3. 5. contains more electrons than protons and therefore has a negative charge
  4. 6. created the gold foil experiment
  5. 8. a substance that can be broken down into another substance
  6. 10. what number is helium on the periodic table
  7. 11. what is sodium’s chemical symbol
  8. 12. created the first periodic table
  9. 13. a molecule that consists of two or more elements chemically bonded
  10. 16. an atom can be considered the smallest unit of an element that retains the ___ of that element
  11. 18. contains more protons than electrons and therefore has a positive charge
  12. 19. discovered the electron
  13. 20. rf is the chemical symbol for ___
  14. 22. an atom or molecule with a net electrical charge
  15. 23. an orbit followed by electrons around the atom’s nucleus
  16. 28. what group is argon found in
  17. 29. mendeleev’s periodic table was published in which century
  18. 31. b is the chemical symbol for ___
  19. 35. how many protons does lithium have
  20. 38. th is the chemical symbol for ___