Meitnerium (109, Mt)

By Gabriella Estrada

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Physical Properties

The atomic mass of meitnerium is [278]. It's density is 37.4. At room temperature, meitnerium is a metallic solid that varies in color. Meitnerium has an electropositivity of 28,200 kg m-3. It's atomic radius, melting point, boiling point, conductivity, malleability, and hardness are unknown.
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Chemical Properties

Meitnerium is not flammable. It's reactivity to other substances is unknown.
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Identifying Information

Meitnerium's atomic number is 109. It's mass number is 268. It has 109 protons, 157 neutrons, and 109 electrons. Meitnerium is grouped with transition metals on the Periodic Table. It can be found on period 7, group 9.
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History and Discovery

Meitnerium was discovered on August 29, 1982. It was first created at the Institute for Heavy Ion Research in Darmstadt, Germany. Peter Armbruster and Gottfried Müzenbur discovered the element. It was made by combining the nuclei of bismuth-209 and iron-58.
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Applications & Uses

Meitnerium is a synthetic element, which means it can only be created, not found. It's uses are unknown, as it has only been made in a small amount due to its high level of radioactivity. Meitnerium has no stable isotopes and no known compounds.
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Fun Facts

Meitnerium was named after Lise Meitner, who was on the scientific team that discovered nuclear fission.