Which sequence of atomic numbers represents elements which have similar chemical properties? a
b
4, 20, 38,88
3, 12, 21, 40
9, 16, 33,50
19, 23, 30, 36
d

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.