Nucleu or Nuclei: How To spell?

The word Nucleu is misspelled against Nuclei, which is plural of "Nucleus"

Word ends with consecutive vowels 'EI' preceded by alphabets 'nucl' is misspelled as 'EU'
Wrong Spelling:  nucl-eu 
Correct Spelling:  nucl-ei 
Check more misspelled words of Nuclei to spell it correct.