Thalous or Thallous: How To spell?
The word Thalous is misspelled against Thallous, an adjective meaning "pertaining to thallium; derived from, containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the thallic compounds."
Thallous has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings tha & ous which should not be misspelled with single 'L'
Wrong Spelling:  tha-l-ous  Correct Spelling:  tha-ll-ous 
Check more misspelled words of Thallous to spell it correct.