No. Roman numerals are only for cations that aren't in either group 1 or 2. For this, you would say Chlorine Tetroxide.
ClO4 is polar.
ClO3 has the smaller bond angle than ClO4
Tetrahedral
Because ClO3- has a lone pair on the central Cl atom, which pushes harder away than a bond would.
ClO4 is polar.
The formula is ClO4-
baking soda.
+7 for Cl and -2 for O in ClO4- ion
mg(clo4)2
Cu(ClO4)2 ==> Cu^2+ and 2ClO4^-
ClO4 is polar.
The molar mass of the perchlorate ion, ClO4- , is 99.44 grams.
ClO3 has the smaller bond angle than ClO4
ClO4-
ClO4-
perchlorate