14820
The binding constant of GO with alpha - ZrP was increased ~ 380 - fold by the addition of either 1 mM Zr ( IV ) or 1 mM Ca ( II ) , and affinities followed the trend Zr ( IV ) ~ Ca ( II ) > Cr ( III ) > Mg ( II ) >> H ( I ) > Na ( I ) .
 alpha - ZrP, Zr ( IV ), Ca ( II ), Zr ( IV ), Ca ( II ), Cr ( III ), Mg ( II ), H ( I ), Na ( I )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 alpha - ZrP, Zr ( IV ), Ca ( II ), Zr ( IV ), Ca ( II ), Cr ( III ), Mg ( II ), H ( I ), Na ( I )