To determine which element is the weakest conductor of electricity among the given options, we consider the general properties of metals and nonmetals. Metals tend to be good conductors of electricity, while nonmetals are typically poorer conductors.
- Nickel (Ni) - A metal; it is a good conductor of electricity.
- Francium (Fr) - A metal as well; though highly radioactive and not commonly encountered, it is still a conductor.
- Cerium (Ce) - A metal (a lanthanide); it conducts electricity effectively.
- Arsenic (As) - A metalloid; while it does conduct electricity, it is not as effective as metals.
Given these considerations, arsenic (As) is likely the weakest conductor of electricity among the given options, as it is a metalloid and tends to conduct less effectively than true metals.
Therefore, the answer is arsenic (As).
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