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