18650
Sensing of biologically important cations such as na ( + ) , k ( + ) , ca ( 2 + ) , cu ( 2 + ) , and fe ( 3 + ) using magnetic nanoemulsions .
 Chemical: na ( + ); Chemical: k ( + ); Chemical: ca ( 2 + ); Chemical: cu ( 2 + ); Chemical: fe ( 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: na ( + ); Chemical: k ( + ); Chemical: ca ( 2 + ); Chemical: cu ( 2 + ); Chemical: fe ( 3 + )