Help me on this please !

Each of the following compounds contains a metal that can exhibit more than one ionic charge. provide systematic names for each of these compounds. (a) cr(clo3)6 (b) mo(cn)6 (c) cr2(so3)3 (d) v(clo2)2 (e) v(cn)5 (f) os(clo2)4

What must occur for air masses to form fronts

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o