hassium

Also known as Hs, element 108, unniloctium, Uno

Hassium is a synthetic chemical element; it has symbol Hs and atomic number 108. It is highly radioactive: its most stable known isotopes have half-lives of about ten seconds. One of its isotopes, Hs, has magic numbers of protons and neutrons for deformed nuclei, giving it greater stability against spontaneous fission. Hassium is a superheavy element; it has been produced in a laboratory in very small quantities by fusing heavy nuclei with lighter ones. Natural occurrences of hassium have been hypothesized but never found.

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Hassium is a synthetic chemical element (atomic number 108) that scientists create in laboratories by fusing heavy nuclei together, and it is extremely radioactive with isotopes that decay in just seconds. It matters to nuclear physics research because one of its isotopes has a special nuclear structure that makes it more stable than expected, helping scientists understand the properties of superheavy elements.

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Key facts

Hassium.engvar: en-OED

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Wikidata facts

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element symbol: Uno
Commons category: Hassium
time of discovery or invention: 1984-01-01
atomic number: 108
Commons gallery: Hassium
Unicode character: 𨭆
electron configuration: [Rn] 5f¹⁴ 6d⁶ 7s²

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Article

17 sections

Contents

Introduction to the heaviest elements
Discovery
Cold fusion
Reports
Arbitration
Naming
Isotopes
Natural occurrence
Predicted properties
Relativistic effects
Physical and atomic
Chemical
Experimental chemistry
Notes
References
Bibliography
External links

In the periodic table, hassium is a transactinide element, a member of period 7 and group 8; it is thus the sixth member of the 6d series of transition metals. Chemistry experiments have confirmed that hassium behaves as the heavier homologue to osmium, reacting readily with oxygen to form a volatile tetroxide. The chemical properties of hassium have been only partly characterized, but they compare well with the chemistry of the other group 8 elements.