zwaarlanthanoïden

Zwaarlanthanoïden refers to a hypothetical group of elements that would extend the lanthanide series in the periodic table. Currently, the lanthanides comprise elements with atomic numbers 57 through 71. The concept of zwaarlanthanoïden, or "heavy lanthanides," arises from theoretical predictions about the existence of elements beyond the current known range, particularly within the hypothetical "island of stability." These predicted elements would be characterized by the filling of the 5g electron subshell, in contrast to the lanthanides, which fill the 4f subshell.

The properties of zwaarlanthanoïden are largely speculative, based on extrapolations of periodic trends. It is anticipated that they would exhibit chemical behaviors similar to the lighter lanthanides, potentially showing a range of oxidation states and forming stable ionic compounds. However, due to their predicted high atomic masses, they are expected to be highly radioactive and have very short half-lives, making their synthesis and study extremely challenging. The existence and specific properties of zwaarlanthanoïden remain a subject of theoretical physics and chemistry, awaiting potential experimental verification through advanced nuclear synthesis techniques.