Atoms, Ions and Acids and Bases

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