First 20 Elements

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Across
  1. 2. Has the symbol B and can prevent osteoarthritis
  2. 4. Used in ceramics and bricks - this element is in group 14 period 3
  3. 7. Low levels of this in your body can cause muscle aches,twitches and even abnormal heart rhythms, it has the symbol K
  4. 8. A common disinfectant for pools, spas and hospitals with the electron arrangement 2, 8, 7
  5. 9. A very reactive metal in the atomic form but once it becomes an ion, is 50% of table salt used in cooking, this atom is found in group 1 period 3
  6. 11. Used often in aviation to make gears and cogs due to its low density - in group 2, period 2
  7. 12. a noble gas that can be used as protection with welding to prevent explosions - is in group 18 period 3
  8. 13. The symbol for this element in He and this is commonly used to inflate balloons due to its low density
  9. 14. The first element in the periodic table and the main constituent of the sun
  10. 15. This metal is used in fireworks and flares as it glows a bright white light upon burning, it has the electron arrangement 2, 8, 2
  11. 18. Used to make high temperature plastics and is found in group 17, period 2
Down
  1. 1. The main element in living things found in group 14, period 2
  2. 3. found in dairy, chia seeds, leafy greens (kale, spinach etc) and is used for bone health it has 20 protons in it's nucleus
  3. 5. This atom has the electron arrangement of 2,1 and is commonly used in batteries
  4. 6. This atom has the electron arrangement 2,5 and is a main constituent of air on Earth
  5. 7. This is the red part of matches and has the electron arrangement 2, 8, 5
  6. 10. A very low density metal used to build aircrafts and rockets with the electron arrangement 2, 8, 3
  7. 16. Given off in geothermal lakes with the symbol S
  8. 17. Used in fluorescent signs. Unreactive due to being a noble has in group 18, period 2
  9. 19. Vital for respiration in humans. Has the electron arrangement 2, 6