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Which compound has the least ionic character?

1.) KI 2.)HCl 3.) MgS 4.) NO

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Bill F. | Experienced Teacher & Tutor in Round Rock, TXExperienced Teacher & Tutor in Round Roc...
5.0 5.0 (1 lesson ratings) (1)

Degree of ionic character can be determined based on differences in electronegativity.  

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The smallest difference in your list of 4 would be between Nitorgen (N) and Oxygen (O), with a difference of 3.44 - 3.04 = 0.40 (all other pairs in your list have larger differences)

Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)

Answer: 4.) NO since N and O are both non metals, and have close electronegativities.