Periodic Table

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Across
  1. 2. Horizontal row on the periodic table
  2. 4. Describes the likelihood of an element to forms bond with other elements
  3. 6. Solid at room temperature; Good conductors of heat and electricity
  4. 8. Special mass unit for the mass of a subatomic particle
  5. 13. Group 18 or 8a
  6. 16. Have properties of both metals and non-metals
  7. 19. Atoms form _____ by gaining or losing electrons
  8. 20. Electron on outermost energy ring; Outside the nucleus
  9. 23. Item used by J.J. Thompson in his experiment to prove that atoms contain electrons
  10. 24. Each element has an atomic _______ that usually consists of one or two letters
  11. 25. My symbol is O
  12. 27. Greek scientist who named the atom "atoms" for indivisible
  13. 28. Mixture containing two or more metallic elements
  14. 29. Scientist who discovered electrons
  15. 32. A form of matter which has mass, occupies a volume, and flows to adopt the shape of its container.
  16. 33. Atoms that contain the same number of protons but different number of neutrons
  17. 35. Subatomic particle located in the nucleus; Neutral charge.
  18. 37. Smallest unit of a compound that contains all the elements of a compound
  19. 38. My symbol is He
Down
  1. 1. The total distance from an atom's nucleus to the outermost electron orbital.
  2. 3. A measure of the attraction an atom has for electrons.
  3. 5. Pure substance; Cannot be broken down into another substance
  4. 7. My symbol is H
  5. 9. A form of matter which has a definite shape and volume.
  6. 10. Number of protons in an element
  7. 11. Group 1 or 1a
  8. 12. A form of matter that has mass but no definite shape, and can be either compressed or expanded to fill an infinite volume.
  9. 14. Electrons are shared; Chemical bond between two non-metals
  10. 15. Subatomic particle located on energy rings outside the nucleus; Negatively charged
  11. 17. A chemical bond between oppositely charged ions that forms when a metal atom gives away an electron and a non metal takes an electron
  12. 18. Chart that displays the information of all known elements according to their properties
  13. 21. Group 17 or 7a
  14. 22. Started the modern theory of atoms; approved Democritus' model of an invisible atom
  15. 26. Vertical column on the periodic table
  16. 30. Neither solid nor good conductors; Not lustrous
  17. 31. Smallest component of an element
  18. 34. Subatomic particle located in the nucleus; Positively charged
  19. 36. Composed of protons and neutrons; Center of the atom