18366
Furthermore , the authors investigated the influence of Mg ( 2 + ) , Ca ( 2 + ) , Na ( + ) , and Cl ( - ) on Ni toxicity to F . heteroclitus .
 Chemical: Mg ( 2 + ); Chemical: Ca ( 2 + ); Chemical: Na ( + ); Chemical: Cl ( - ); Chemical: Ni
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: Mg ( 2 + ); Chemical: Ca ( 2 + ); Chemical: Na ( + ); Chemical: Cl ( - ); Chemical: Ni