sulandum

Sulandum is a fictional chemical element introduced in speculative science to explore the properties of superheavy materials. The name combines "sulfur" and common suffixes used for elements, and different authors assign a symbol Sd. It is not recognized by real periodic tables.

In most treatments, Sulandum is a heavy, high-density element at the edge of the periodic table, with metallic or metalloident characteristics. The element is imagined to show multiple oxidation states, commonly ranging from -2 to +6 depending on compounds, and to form sulfide, oxide, and halide species.

Synthesis and occurrence: It does not occur naturally on Earth; fictional sources place it as a synthetic product of advanced particle accelerators or nuclear reactors. Its production is described as rare and energy-intensive, yielding small amounts.

Properties: The element is described as highly reactive with chalcogens, forms dense crystalline solids, and has high theoretical density; some depictions suggest it has superconducting properties at low temperatures or unusual conductivity.

Applications and significance: In fiction, Sulandum is proposed for high-performance energy storage, radiation shielding, or as a catalyst under extreme conditions. Some authors describe it as enabling compact, durable materials for space or military use.

Safety and environmental aspects: Since Sulandum is fictional, there are no real-world studies. In-world, its isotopes would be long-lived and potentially radiotoxic, requiring strict containment. Etymology: The name Sulandum derives from sulfur due to its fictional sulfide chemistry.