Yterbium or Ytterbium: How To spell?
The word Yterbium is misspelled against Ytterbium, a noun meaning "A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium."
Ytterbium has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings y & erbium which should not be misspelled with single 'T'
Wrong Spelling:  y-t-erbium  Correct Spelling:  y-tt-erbium 
Check more misspelled words of Ytterbium to spell it correct.