Periodic Table

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