Chemistry

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Across
  1. 4. substances that cannot be broken down into simpler substances
  2. 6. Formulas a combination of chemical symbols & numbers that indicate which elements & how many atoms of each element are present in a compound
Down
  1. 1. a small space at the center of an atom which contains protons and neutrons
  2. 2. the smallest particle of an element
  3. 3. change occurs when the physical properties are changed, such as size or shape
  4. 5. Mendeleev a Russian scientist discovered a set of patterns that seemed to apply to all elements
  5. 7. Moseley discovered a way to measure the positive charge in the nucleus to determine the atomic number