Further data for radioisotopes (radioactive isotopes) of ytterbium are listed separately (including any which occur naturally) in the radioisotopes section. This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments.

Isotope	Atomic mass (ma/u)	Natural abundance (atom %)	Nuclear spin (I)	Magnetic moment (μ/μN)
168Yb	167.933894 (5)	0.13 (1)	0
170Yb	169.934759 (4)	3.04 (15)	0
171Yb	170.936323 (3)	14.28 (57)	1/2	0.4919
172Yb	171.936378 (3)	21.83 (67)	0
173Yb	172.938208 (3)	16.13 (27)	5/2	-0.6776
174Yb	173.938859 (3)	31.83 (92)	0
176Yb	175.942564 (4)	12.76 (41)	0

In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which total 100% for all the naturally occurring isotopes.