Rutherfordium is a synthetic, highly radioactive transition metal with atomic number 104, belonging to group 4 of the periodic table alongside titanium, zirconium, and hafnium. It is produced in heavy-ion fusion reactions, typically by bombarding actinide targets with lighter ions, and has no stable isotopes; its known isotopes exhibit short half-lives, constraining experimental investigation. Research on rutherfordium focuses on relativistic quantum-chemical effects, gas-phase and aqueous chemistry, and the validation of periodic trends in the transactinide region, often using atom-at-a-time techniques such as rapid chemical separation coupled with online alpha-spectroscopy to probe its oxidation states and complex formation behavior.
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