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The sequential bond energies of Mg ( 2 + ) ( H2O ) x complexes , in which x = 2 - 10 , are measured by threshold collision - induced dissociation in a guided ion beam tandem mass spectrometer .
 Chemical: Mg ( 2 + ) ( H2O ) x
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: Mg ( 2 + ) ( H2O ) x