Why can the positive ions be considered to be fixed during the electrons’ oscillations?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

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

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds