Matter Unit Vocabulary Part 2

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Across
  1. 3. a mixture that does not have a uniform composition throughout
  2. 5. the number of protons in the nucleus of an atom
  3. 8. a combination of two or more substances that are not chemically combined
  4. 10. an atom's central region
  5. 11. an element that is shiny and that conducts heat and electricity well
  6. 13. a mixture that has a uniform composition throughout
  7. 14. a substance made up of atoms of two or more different elements joined by chemical bonds
  8. 15. a subatomic particle that has a positive charge
  9. 16. an element that conducts heat and electricity poorly
  10. 18. a vertical column of elements in the periodic table
Down
  1. 1. the sum of the numbers of protons and neutrons in the nucleus of an atom
  2. 2. an arrangement of the element in order of their atomic numbers
  3. 4. the weighted average of the masses of all naturally occurring isotopes of an element
  4. 6. an element that has properties of both metals and nonmetals
  5. 7. a subatomic particle that has a negative charge
  6. 9. a horizontal row of elements in the periodic table
  7. 10. a subatomic particle that has no charge
  8. 12. a substance that cannot be separated into simpler substances by chemical means
  9. 17. the smallest unit of an element