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  • 18-11-2017
  • Chemistry
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what periodic family has no elements in the Earth's crust

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LadyK13
LadyK13 LadyK13
  • 18-11-2017
subcribe to my youtube channel

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KnowItAllCat
KnowItAllCat KnowItAllCat
  • 19-11-2017
Alkaline earth metals I think.
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