Atoms, Substances, and the Periodic Table

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Across
  1. 3. Positive particle in the nucleus
  2. 5. Chemical _____ is one- or two-letter element code
  3. 7. Alloy of iron and carbon
  4. 9. Shiny, conductive, malleable element
  5. 10. Discovered the electron
  6. 11. Arranged first periodic table by mass
  7. 12. _______ electrons are in the outermost shell
  8. 14. Substance made of one kind of atom
  9. 16. Vertical column in the periodic table
  10. 18. First to suggest atoms exist
  11. 20. _______ particles are protons, neutrons, and electrons
  12. 22. Found the nucleus using gold foil
  13. 23. ______ shell is the outermost shell of an atom
  14. 26. _____ table organizes all known elements
  15. 27. _____ ray is the beam that led to discovery of electrons
  16. 29. Central part of an atom
  17. 30. Alloy of copper and tin
  18. 32. Electron ______ is the arrangement of electrons in shells
  19. 34. Proposed modern atomic theory
  20. 35. ____ particle is an Helium nucleus used in atom experiments
  21. 36. _____ mass is the verage mass of an element’s atoms
  22. 40. Mixture of a metal with other elements
  23. 41. _____ property describes how a substance reacts
  24. 42. Discovered the neutron
  25. 43. Described electron clouds using maths
Down
  1. 1. Likely to form chemical bonds
  2. 2. Chemical _______ Symbols showing atoms in a substance.
  3. 4. Type of matter with specific makeup
  4. 6. Two or more elements chemically joined
  5. 8. A feature used to describe matter
  6. 11. Has properties of metals and non-metals
  7. 13. smallest unit of an element
  8. 15. _____ property can be observed without changing the substance
  9. 17. Breaks or shatters when bent
  10. 19. Tiny negative particle orbiting the nucleus
  11. 21. Group of atoms bonded together
  12. 24. Neutral particle in the nucleus
  13. 25. Said electrons orbit in energy levels
  14. 26. Horizontal row in the periodic table
  15. 28. A testable scientific prediction or idea
  16. 31. Electrically _____ means equal protons and electrons
  17. 33. ____ pudding is Thomson’s model of the atom
  18. 37. Can be hammered into shapes
  19. 38. Can be stretched into a wire
  20. 39. _____ number is the number of protons in an atom
  21. 43. Electron _____ is where electrons orbit the nucleus