Periodic Table Crossword

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Across
  1. 3. he total weight of an atom is called the atomic weigh
  2. 7. a tabular array of the chemical elements organized by atomic number
Down
  1. 1. chemical nomenclature is a set of rules to generate systematic names for chemical compounds
  2. 2. Chemical symbols are the abbreviations used in chemistry for chemical elements
  3. 4. the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
  4. 5. n chemistry, a nonmetal is a chemical element that generally lacks a predominance
  5. 6. valuable primarily because they are radioactive