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  • Chemistry
  • Goodbye and thank you Mr. Wong.
  • Goodbye boys and girls !
  • What happen,Peter?
  • I've some qusetions.Can you help me?
  • Is ther any 3 different elements have a same Chemical or Physical property ?
  • Sure !
  • Yes,you've said it in the last lession.
  • Do you know lithium, sodium and potassium are alkali metals ?
  • They all react with cold water forming a soluble alkaline hydroxide and hydrogen gas.They are less dense than water and so they float.
  • Yes,thank you very much !
  • You're welcome !
  • Do you understand?
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