Maksindexum

Maksindexum is a hypothetical chemical element posited in certain theoretical models and speculative fiction. In these discussions, its proposed placement lies among the superheavy elements, with an atomic number commonly set at 126 and a symbol Mk. The element is used as a reference point for discussions about the island of stability and the limits of the periodic table.

The name maksindexum combines a fictional surname Maksin (or Maks) with the -indexum suffix used in speculative element naming; the symbol Mk is proposed in these scenarios.

Theoretical properties attributed to maksindexum come from relativistic quantum-chemical calculations that place it near the predicted island of stability, suggesting possible relative nuclear stability for certain isotopes and a high density. Its electronic structure could feature extended f- or g-block characteristics and unusual oxidation states, though predictions vary widely. In many models it would remain highly reactive only under extreme conditions, with chemistry that differs markedly from neighboring elements.

Synthesis, evidence, and status: Maksindexum has not been observed experimentally. Production would require sustained heavy-ion collisions at energies and cross sections not currently achievable, and even if formed would likely decay rapidly. As such, it lies outside the current officially observed elements and remains a topic of theoretical and fictional discussion.

Context and reception: In the literature, maksindexum is used to illustrate questions about the limits of the periodic table, superheavy chemistry, and the role of relativistic effects in element properties. It is generally treated as a hypothetical construct rather than a real, discovered element.