PERIODIC TABLE

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Across
  1. 5. Atomic mass 4.0026; second lightest element, used in balloons.
  2. 6. Symbol P; found in matches and fertilizers.
  3. 7. Atomic mass 12.011; forms diamonds and graphite.
  4. 14. Symbol N; makes up about 78% of Earth’s atmosphere.
  5. 15. Symbol O; gas essential for breathing.
  6. 16. Symbol Mg; burns with a bright white flame.
  7. 17. Symbol Ca; vital for bones and teeth.
  8. 20. Symbol Ag; shiny metal used in jewelry and coins.
  9. 22. Symbol Be; used in alloys and gemstones.
  10. 23. Atomic number 25; used in batteries and steel.
  11. 24. Atomic mass 47.867; strong, lightweight metal.
  12. 25. Atomic number 18; inert gas used in welding.
Down
  1. 1. Atomic number 13; used for foil and aircraft.
  2. 2. Atomic mass 35.45; disinfectant used in pools.
  3. 3. Symbol K; needed by nerves and muscles.
  4. 4. Symbol Cr; makes stainless steel shiny.
  5. 8. Atomic number 30; used to galvanize steel.
  6. 9. Atomic mass 18.998; added in toothpaste for dental health.
  7. 10. Symbol Cu; good conductor used in wires.
  8. 11. Atomic number 11; soft metal that reacts with water.
  9. 12. Atomic number 1; lightest and most abundant element in the universe.
  10. 13. Atomic number 79; precious yellow metal.
  11. 18. Atomic mass 28.085; key material in electronics.
  12. 19. Atomic number 16; yellow element with a strong odor.
  13. 21. Atomic mass 55.845; main component of steel.