A radioactive nuclide has a half life of 3.0 days. If 2.0 kilograms of the sample remains unchanged after 9.0 days what was the initial mass of the sample

Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.