Periodic table

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Across
  1. 2. a pure substance made of only one type of atom, which cannot be broken down into simpler substances by chemical means
  2. 3. a chart that organizes all known chemical elements by their atomic number.
  3. 4. an atom or molecule that has a net electrical charge because it has a different number of electrons than protons.
  4. 6. a characteristic of a substance that can be observed or measured without changing the substance's chemical identity
  5. 8. the total count of protons and neutrons in an atom's nucleus
Down
  1. 1. an area outside the nucleus where electrons are found
  2. 5. The number of protons in an atom
  3. 7. a one- or two-letter abbreviation used to represent an element on the periodic table.