science

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Across
  1. 1. mber number protons plus neutrons
  2. 3. tiny but heavy particle found in the nucleus of an atom
  3. 5. pure substance made up of one atom
  4. 7. test flame test for presence of hydrogen gas
  5. 9. very light negatively charged particles inside an atom move around the central nucleus of an atom
  6. 12. of electricity metal
  7. 14. substance made up of two or more types of atoms which have been joined together
  8. 15. not bendy
  9. 16. semi-conductive lustrous
  10. 18. shiny
  11. 19. bendy
Down
  1. 1. lustrous malleable conductive solid ductile
  2. 2. tiny but heavy positively charged found in the nucleus of an atom
  3. 4. number of protons in the nucleus of an atom
  4. 6. a combination of substances in which it keeps its own properties
  5. 8. gaseous brittle solid
  6. 10. not conductive
  7. 11. two or more atoms joined together
  8. 13. the central part of an atom made up of protons and neutrons
  9. 17. very small particles that make up everything