Elemental Enigmas: Periodic Table Crossword

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Across
  1. 2. A group of elements in the f-block with atomic numbers 57 to 71, known as rare earth elements.
  2. 4. The principle that the properties of elements recur periodically when arranged by increasing atomic number.
  3. 6. Element with atomic number 17, used in table salt.
  4. 7. ,A noble gas with atomic number 2.
  5. 8. ,the number of protons in an atom's nucleus and used to identify elements in the periodic table.
  6. 11. English physicist who determined the concept of atomic number in 1913.
  7. 12. this element has an atomic number of 26 and is essential for blood health.
  8. 13. A horizontal row in the periodic table that represents the number of electron shells an atom possesses.
  9. 15. Group 1 elements known for their reactivity and tendency to form alkaline solutions.
  10. 17. Group 18 elements characterized by their low reactivity and stable electronic configurations.
  11. 18. English chemist who proposed the law of octaves in 1864, a precursor to the modern periodic table.
  12. 19. the element with atomic number 79, known for its use in jewelry.
Down
  1. 1. A vertical column in the periodic table representing elements with similar properties.
  2. 3. Atomic number of the lightest and most abundant element in the universe.
  3. 5. Elements found in Groups 3 to 12 known for their variable oxidation states and catalytic properties.
  4. 9. Element with atomic number 8, a vital gas for respiration.
  5. 10. The only noble gas with a single-digit atomic number.
  6. 11. Russian chemist credited with creating the first widely recognized periodic table in 1869.
  7. 14. Group 17 elements known for their high reactivity and tendency to form salts.
  8. 16. Atomic number of the first alkali metal.