Elements, atoms and ions

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Across
  1. 10. Group of elements including the most reactive gases in the periodic table
  2. 11. Group of f-block metals starting with element 57
  3. 12. A hydrogen atom with one proton in the nucleus
  4. 13. The metal at which the stellar production of elements stops
  5. 14. Positively charged subatomic particle found in the nucleus
  6. 15. the only metal that is liquid at standard conditions of temperature and pressure
  7. 16. The element with symbol K
Down
  1. 1. The most abundant element in the Universe
  2. 2. Name given to Germanium before its discovery
  3. 3. The second most abundant element in biological systems
  4. 4. Metals including lithium and sodium
  5. 5. One of the latest addition to the periodic table: its name is a celebration of the Japanese team that discovered it
  6. 6. Elemental particle with mass of 10^-31 kg
  7. 7. Subatomic particle made of 1 up and 2 down quarks
  8. 8. The forms of an element that have the same atomic number but different number of neutrons
  9. 9. post-transition metal that melts in a cup of tea