Basic Periodic Table Vocab

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Across
  1. 1. elements that tend to gain electrons in chemical reactions; found at the upper right side of the periodic table
  2. 4. one of two or more atoms with the same number of protons but different numbers of neutrons
  3. 7. the group 7A or 17 elements, which are very reactive nonmetals
  4. 8. an arrangement of the elements in which atomic number increases from left to right and elements with similar properties fall in columns called families or groups
  5. 15. the elements in columns designated with B or in columns 3-12 of the periodic table
  6. 17. the group 2A elements, which are fairly reactive metals
  7. 19. elements that have similar outer electron configurations and therefore similar properties
  8. 20. the group 1A elements, which are highly reactive metals
  9. 21. elements that tend to lose electrons in chemical reactions; found on the left side and in the center of the periodic table
  10. 22. the energetic particles emitted from the nucleus of an atom when it is undergoing a nuclear process
  11. 24. a group of elements that have similar
Down
  1. 2. the group 8A or 18 elements, which are chemically unreactive
  2. 3. a positively charged ion
  3. 5. groups 1A thru 8A on the periodic table
  4. 6. a negatively charged ion
  5. 9. the percentage amount of each isotope of an element in a naturally occurring sample of the element
  6. 10. a weighted average of the masses of each naturally occurring isotope of an element
  7. 11. a compound or element exhibiting intermediate electrical conductivity that can be changed and controlled
  8. 12. describes a substance that emits tiny, invisible, energetic particles from the nuclei of its component atoms
  9. 13. a law that states that when the elements are arranged in order of increasing relative mass, certain sets of properties recur periodically
  10. 14. the sum of the number of neutrons and protons in an atom
  11. 16. the elements in the middle of the periodic table whose properties tend to be less predictable based simply on their position in the periodic table
  12. 18. those elements that fall along the boundary between the metal and the nonmetal in the periodic table
  13. 23. an atom or group of atoms that has gained or lost one or more electrons, so that it has an electric charge