Naturally occuring iron contains 5.82% ^54Fe, 91.66% ^56Fe, 2.91% ^57Fe and 0.33% ^58Fe. The respective atomis masses are 53.940 amu, 55.935 amu, 56.935 amu and 57.933 amu. Calculate the average atomic mass of iron. (show work)

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull