Across
- 3. The number of protons is represented by this
- 4. The cluster of protons and neutrons at the centre of an atom
- 9. Atoms which have lost electrons and become positively charged
- 11. A cluster of the atoms that makes up an element or a compound
- 14. A subatomic particle is positively charged
- 15. The representation of the number of electrons in each shell of an atom
- 16. These particles have no electric charge and are found in the nucleus
- 18. The number that represents the number of protons and neutrons
- 19. A substance that is made of only one type of atom
- 20. Atoms that have the same number of protons but different number of neutrons
Down
- 1. Atoms which have lost or gained electrons to become charged
- 2. A grid-like structure of atoms where particles are bonded together
- 5. When two or more substances are simply mixed together
- 6. A pure substance that is made up of two or more different types of atoms
- 7. Cloud layers that surround the nucleus that hold only a certain number of electrons
- 8. The fundamental building blocks of all matter
- 10. When an anion and cation combine together
- 12. These particles have a negative charge and surround the nucleus
- 13. The attraction between the charges of ions
- 17. Atoms which have gained electrons and become negatively charged