Chapter 3 Vocab Chemistry

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Across
  1. 2. weighted average mass of the atoms in a naturally occurring sample of the element.
  2. 4. species of atom as characterized by the number of protons, the number of neutrons, and the energy state of the nucleus.
  3. 5. the mass in grams of 1 mole of the substance.
  4. 9. used to express atomic and molecular weights
  5. 11. the number of atoms or molecules in one mole of a substance
  6. 12. states that if two elements form more than one compound, then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.
Down
  1. 1. states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.
  2. 3. sometimes called Proust's law, or law of constant composition
  3. 5. base unit of amount of substance in the International System of Units.
  4. 6. the total number of protons and neutrons in a nucleus.
  5. 7. number found on the top left of an element on the periodic table.
  6. 8. strong attractive force between nucleons in the atomic nucleus that holds the nucleus together.
  7. 10. one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table.
  8. 11. smallest unit of ordinary matter that forms a chemical element.