Across
- 5. Shows how electrons are arranged in their shells
- 9. Exists as single atoms
- 12. Bonding between non-metallic atoms
- 13. Metals that are in group 1
- 15. Core of an atom
- 16. The lightest of all the elements
- 17. Formed when electrons transfer from one atom to another
- 18. A special block of elements in groups 3–12
- 19. Number that tells you how many protons are in the nucleus
- 20. Small group of atoms bonded together
Down
- 1. Bonding based on an electron ‘sea’
- 2. Bonding that involves complete transfer of electrons
- 3. Group 18 gases
- 4. Non-metals that are in group 17
- 6. Elements that have the same proton number but different numbers of neutrons
- 7. Extended 3D structure
- 8. 118 of these are known to exist
- 10. Vertical columns in the periodic table
- 11. Horizontal rows in the periodic table
- 13. one of two special blocks of elements at the bottom of the periodic table
- 14. Different forms of the same element