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Because Zn ( 2 + ) and Mg ( 2 + ) have similar ionicity and atomic radii , some Zn ( 2 + ) atoms are replaced by Mg ( 2 + ) atoms in the crystals , leading to a change in the properties of crystal lattices .
 Chemical: Zn ( 2 + ); Chemical: Mg ( 2 + ); Chemical: Zn ( 2 + ); Chemical: Mg ( 2 + )
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: Zn ( 2 + ); Chemical: Mg ( 2 + ); Chemical: Zn ( 2 + ); Chemical: Mg ( 2 + )