Across
- 7. The measure of extra positive or negative particles
- 10. A pure substance made of only one type of atom
- 11. Group 1 elements on the periodic table
- 13. The charge of an electron
- 15. A row in the periodic table
- 17. It describes how electrons are arranged around a nucleus
- 18. A column on the periodic table
- 20. A particle with some mass and no charge
- 21. The centre of an atom made of protons & neutrons
- 22. The smallest unit of an element; made of electrons, protons and neutrons
- 23. Group 18 elements on the periodic table that are inert
Down
- 1. The space where electrons move; like an orbital
- 2. Electrons in the outermost shell, furthest away from the nucleus if an atom
- 3. The path where electrons move around the nucleus; like a shell
- 4. Total number of protons and neutrons in the nucleus of an atom
- 5. Group 17 elements on the period table
- 6. Group 2 elements on the periodic table
- 8. The number of protons in the nucleus of an atom
- 9. A chart of elements showing the pattern of their properties
- 12. The charge of a proton
- 14. A negatively charged particle with negligible (almost zero) mass
- 16. A positively charged particle with some mass
- 19. It describes something that doesn't react