Atomic Structure

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Across
  1. 6. Two or more atoms bonded together (8)
  2. 7. Total number of protons and neutrons in an atom (4, 6)
  3. 9. Substance made of two or more elements chemically bonded (8)
  4. 10. Number of protons in an atom’s nucleus (6, 6)
  5. 12. Element with an atomic number of 5 (5)
  6. 14. Noble gas with atomic number 2 (6)
  7. 16. Bond formed by sharing electrons between atoms (8, 4)
  8. 17. Path electrons follow around the nucleus (5)
  9. 18. Attraction between oppositely charged ions (5, 4)
  10. 20. Positively charged particle in the nucleus (6)
  11. 22. When an atom’s outer shell is full (6)
  12. 23. Negatively charged particle orbiting the nucleus (8)
  13. 24. Vertical column of elements with similar properties (5)
Down
  1. 1. Energy levels where electrons are found (6)
  2. 2. Element with the atomic symbol Au (4)
  3. 3. Organises elements by atomic number and properties (8, 5)
  4. 4. One or two letters representing an element (6)
  5. 5. Horizontal row of elements in the periodic table (6)
  6. 8. Soft metal with the atomic symbol Na (6)
  7. 11. Combined number of protons and neutrons (6, 4)
  8. 13. Neutral particle found in the nucleus (7)
  9. 15. Atom with same number of protons but different neutrons (7)
  10. 18. Atom that has gained or lost electrons (3)
  11. 19. Dense central core of an atom (7)
  12. 21. Gas essential for respiration, atomic number 8 (6)