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These batteries feature promising selectivity between lithium and sodium , but they suffer from severe interference from coexisting magnesium ions , an essential component of brine , which has prompted further study .
 lithium, sodium, magnesium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 lithium, sodium, magnesium