164495
Structure Like its " unsaturated " relatives ethenium and ethynium , the ethanium ion was conjectured to have ( at least momentarily ) a proton bound simultaneously to the two carbon atoms , and the electrical charge evenly spread between them , as in other non-classical ion s. The alternative " classical " structure would have the charge and the extra hydrogen bound to only one of the two atoms , i.e. a methyl ated methanium ion .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None