Atoms and the Periodic Table

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Across
  1. 4. A chemical bond in which a hydrogen atom of one molecule is attracted to an electronegative atom
  2. 8. Elements that are poor conductors of heat and electric current
  3. 9. The smallest unit of matter that can’t be broken down by chemical means
  4. 10. Atoms of an element that have different numbers of neutrons
  5. 11. Hard but liable to break or shatter easily
  6. 13. These metals have a single valence electron and are extremely reactive
  7. 15. Have three valence electrons
  8. 17. A group of atoms held together by covalent bonds
  9. 18. Elements that form a bridge between the elements on the left and right sides of the table
  10. 19. Each row in the table of elements
  11. 20. Chemical bond that shares electrons
  12. 23. Able to be hammered or pressed permanently out of shape without breaking or cracking
  13. 24. An atom or group of atoms that has an electric charge because it has gained or lost electrons
  14. 26. Have four valence electrons
  15. 28. An electron that is found in the outermost shell of an atom
  16. 31. Elements that are good conductors of electric current and heat
  17. 32. A subatomic particle that does not has a charge
  18. 33. The equivalent to the number of protons and neutrons in the atom
  19. 35. Positively charged subatomic particle
  20. 36. A substance made up a group of similar atoms that have the same number of protons
Down
  1. 1. A weighted average based upon the percent isotopic ratio of the element
  2. 2. Negatively charged subatomic particle
  3. 3. Group of elements with six valence electrons
  4. 5. Group of elements that are extremely unreactive
  5. 6. Has the capability of being drawn into thin wires
  6. 7. Elements with properties that fall between those of metals and nonmetals
  7. 12. Have five valence electrons
  8. 14. Have two valence electrons
  9. 16. The attractive force between oppositely charged ions
  10. 21. The number of protons in the nucleus of an atom, which determines its place in the periodic table
  11. 22. The region where electrons orbit the nucleus
  12. 25. Atomic particle that consists of protons and neutrons
  13. 27. Each column in the periodic table
  14. 29. Chemical bonds form between groups of atoms because most atoms become stable when they have eight electrons in the valence shell
  15. 30. Group of elements with seven valence electrons
  16. 34. A substance made of the bonded atoms of two or more different elements