chemistry

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Across
  1. 1. makes your voice high pitched
  2. 3. a lot of money
  3. 5. a special block of metallic elements with the atomic numbers 90-103
  4. 7. number of protons in an atom
  5. 10. group 17 elements
  6. 11. we breathe it
  7. 12. this element rusts
Down
  1. 2. a special block of metallic elements with atomic numbers 58-71
  2. 3. our teacher
  3. 4. also known as inert gases
  4. 6. heavy core at the centre of the atom, made of protons and neutrons
  5. 8. discrete groupings of atoms covalently bonded together
  6. 9. compound that is or was part of a living thing; contains carbon