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Just over one gram of berkelium has been produced in the United States since 1967
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Californium is produced in nuclear reactors and particle accelerators
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Einsteinium is the first divalent metal in the actinide series
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Sixteen isotopes of fermium are known to exist
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Mendelevium was the first element to be produced one atom at a time
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Nobelium is a divalent ion in aqueous solution
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Lawrencium is a trivalent ion in aqueous solution
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Rutherfordium is the first transactinide element
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The Berkeley team proposed the name hahnium for the element
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There are 12 known isotopes of seaborgium
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The only confirmed example of isomerism in bohrium is in the isotope <sup>262</sup>Bh
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More than 100 atoms of hassium have been synthesized to date
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Meitnerium has 7 isotopes whose half-lives are known
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Darmstadtium has no stable or naturally-occurring isotopes
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Roentgenium has no stable or naturally-occurring isotopes
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Copernicium has no stable or naturally-occurring isotopes
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Nihonium is historically known as eka-thallium
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The longest-lived isotope currently known is <sup>289</sup>Fl
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Moscovium is historically known as eka-bismuth
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Livermorium is historically known as eka-polonium
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Tennessine is historically known as eka-astatine
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Oganesson is historically known as eka-radon
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Hydrogen poses a number of hazards to safety, from fires when mixed with air to being an asphyxiant in its pure form
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Helium is not known to be toxic
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Lithium is corrosive and requires special handling to avoid skin contact
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Beryllium and its salts are toxic and should be handled with the greatest of care
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Elemental boron, boron oxide, boric acid, borates and many organoboron compounds are non-toxic
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Pure carbon has extremely low toxicity to humans and can be handled safely in the form of graphite or charcoal
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Rapid release of nitrogen gas into an enclosed space can displace oxygen, and therefore represents an asphyxiation hazard
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Oxygen gas can be toxic at elevated partial pressures, leading to convulsions and other health problems
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Fluorine is highly toxic and corrosive
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Neon is not known to be toxic
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Sodium metal should be handled with great care as it cannot be maintained in an inert atmosphere
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Because serious fires can occur, great care should be taken in handling magnesium metal
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Aluminium is not known to be toxic
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If breathed in as a fine silica/silicate dust, it may cause chronic respiratory problems
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White phosphorus is highly toxic while red phosphorus is considered non-toxic
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Elemental sulfur is considered to be of low toxicity
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Elemental chlorine at high concentrations is extremely dangerous and poisonous
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Argon is considered to be non-toxic
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Potassium must be handled with great care with full skin and eye protection
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Calcium is considered to be non-toxic
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Scandium is considered to be of low toxicity
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Titanium metal is considered to be non-toxic
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All vanadium compounds should be considered toxic
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In larger amounts, chromium can be toxic and carcinogenic
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Excess manganese, particularly inhalation of the powder, is toxic
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Iron is considered to be non-toxic
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Cobalt and its compounds are considered to be slightly toxic
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Nickel and its compounds are considered to be carcinogenic
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