Unit 1 Vocabulary

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Across
  1. 2. atoms of the same element that have the same atomic number but different atomic masses due to different numbers of neutrons
  2. 5. vertical columns of elements in the periodic table, made of elements with similar physical properties
  3. 6. a compound that produces hydrogen ions in solution
  4. 8. the total number of protons and neutrons in the nucleus of an atom
  5. 10. an element in group 8A of the periodic table, they ahave the s and p of the highest energy level filled
  6. 11. one of the group B elements that the highest occupied s and nearest d sublevels contain electrons
  7. 13. horizontal rows of elements in the periodic table
  8. 15. the weighted average of the masses of isotopes of certain elements
  9. 17. a negatively charged subatomic particle
  10. 18. a positively charged subatomic particle
  11. 19. one of a class of elements that are good conductors of heat and electric current, tend to be ductile, malleable and shiny
  12. 21. an element that tends to be a poor conductor of heat and electric current, generally have properties opposite of metals
  13. 22. a negatively charged ion
  14. 23. a unit of mass equal to one-twelfth of the carbon-12 atom
Down
  1. 1. a tightly bound group of atoms that behave as a unitand has a positive or negative charge
  2. 3. a one or two letter symbol representation of an element
  3. 4. the region of an atom that contains the protons and neutrons
  4. 7. a postively charged ion
  5. 9. an element that tends to have properties that are similar to metals and nonmetals
  6. 10. a subatomic particle with no charge
  7. 12. an expression that indicates the number and types of atoms present in the smallest representative unit of a substance
  8. 14. the smallest particle of an element that retains its identity in a chemical reaction
  9. 16. an atom or group of atoms that have a positive or negative charge
  10. 20. the number of protons in the nucleus of an atom of an element