Final answer:
The formula for solid technetium carbonate, assuming technetium is in the +7 oxidation state, is Tc2(CO3)7, and the phase symbol for a solid is (s), making the full notation Tc2(CO3)7(s).
Step-by-step explanation:
To write the formula for solid technetium carbonate, we need to identify the ions involved and their charges. Technetium, as a transition metal, can have multiple oxidation states, but one common oxidation state is +7. While carbonate is a polyatomic ion with a charge of -2 (CO32-). Assuming technetium is in the +7 oxidation state, the formula should balance the total positive and negative charges.
For technetium (VII) carbonate, the formula would be Tc2(CO3)7. The phase symbol for a solid is (s), so the full notation for solid technetium carbonate would be Tc2(CO3)7(s).