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Especially , the gels rapidly formed by trivalent metal ions such as Fe ( 3 + ) , V ( 3 + ) , Al ( 3 + ) , Ti ( 3 + ) , and Ga ( 3 + ) have relatively small ionic radii .
 Chemical: Fe ( 3 + ); Chemical: V ( 3 + ); Chemical: Al ( 3 + ); Chemical: Ti ( 3 + ); Chemical: Ga ( 3 + )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Fe ( 3 + ); Chemical: V ( 3 + ); Chemical: Al ( 3 + ); Chemical: Ti ( 3 + ); Chemical: Ga ( 3 + )