Chemistry Revision

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Across
  1. 1. The law of conservation of __ says that matter is never created or destroyed
  2. 4. The number of electrons in an atom is the same as the number of ___ in the atom
  3. 6. The type of radiation particles that cannot penetrate plastic or wood
  4. 10. On the pH scale the number 7 is ___
  5. 12. The name of the tenth element
  6. 13. The ___ number is different for each element and is the number of protons in an atom
  7. 16. H is the symbol for which element
  8. 17. The type of reaction where energy is taken in from the environment eg. ice pack
  9. 19. The ___ table includes all the elements ordered by their atomic number
  10. 20. Atoms of the same element with different mass numbers
  11. 21. The neutral particles in an atom
  12. 23. This element has an atomic number of 5
  13. 24. On the pH scale the numbers from 8-14 are ___
Down
  1. 2. On the pH scale the numbers from 0-6 are ___
  2. 3. The name of a reaction where a substance reacts with oxygen and heat is released
  3. 5. Together the protons and neutrons form the ___ in the centre of the atom
  4. 7. The 'building blocks' of matter, what all matter is made up of
  5. 8. The type of reaction where energy is released eg. a heat pack
  6. 9. The new substances that are formed after a chemical reaction
  7. 11. The type of radiation particles that can only be stopped by thick lead or concrete
  8. 14. Cl is the symbol for which element
  9. 15. The negative particles in an atom that orbit on shells
  10. 18. The type of radiation particles that can easily be stopped by a piece of paper
  11. 22. The number of protons in a Lithium atom
  12. 25. Carbon's atomic number