Among H2,He2+,Li2,Be2,B2,C2,N2,O2−,and F2  the number of diamagnetic species is (Among numbers: H=1,He=2,Li=3,Be=4,B=5,C=6,N=7,O=8,F=9)

H2= diamagnetic He2+=paramagnetic Li2= Diamagnetic Be2= Does not exist B2= Paramagnetic due to s−p− mixing C2= diamagnetic due to −s−p mixing N2=diamagnetic⁡14e−O2−=paramagnetic⁡17e−F2= diamagnetic Though Be2 does not exist it is Diamagnetic in nature.