Rhodamonium or Rhodammonium: How To spell?
The word Rhodamonium is misspelled against Rhodammonium, an adjective meaning "Pertaining to, derived from, or containing, rhodium and ammonia; -- said of certain complex compounds."
Rhodammonium has double "mm" is mispronounced as "m"Remember double 'MM' in between the strings rhoda & onium which should not be misspelled with single 'M'
Wrong Spelling:  rhoda-m-onium  Correct Spelling:  rhoda-mm-onium 
Check more misspelled words of Rhodammonium to spell it correct.