periodic table and health and lifestyle

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Across
  1. 2. Elements that typically have a shiny appearance and conduct electricity (6)
  2. 4. A chemical element essential for the growth and maintenance of bones and teeth (7)
  3. 6. Elements that are generally poor conductors of heat and electricity (9)
  4. 9. The number of protons in an atom (6)
  5. 11. The overall condition of an organism at a given time (6)
  6. 13. A tabular arrangement of chemical elements (8)
  7. 14. Group 1 elements on the periodic table (5)
  8. 15. A substance formed when two or more chemical elements are chemically bonded together (8)
Down
  1. 1. An organic compound essential for normal growth and nutrition (7)
  2. 3. Substance made up of one type of atom (6)
  3. 5. Activity Bodily movement produced by skeletal muscles that requires energy expenditure (8)
  4. 7. A substance that provides nourishment essential for growth and the maintenance of life (7)
  5. 8. A horizontal row in the periodic table (6)
  6. 10. The process by which cells break down simple food molecules to release energy (11)
  7. 12. The basic structural, functional, and biological unit of all known living organisms (4)