Uranium-235 has a half-life of 713 million years, while carbon-14 has a half-life of about 5,730 years. which isotope would be more useful for dating a fossil from precambrian time?

Uranium-235 is more useful.

Uranium - 235. It has a longer half - life, which means that it can be used to trace events/items further back in history than carbon - 14 can.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Its a hope this