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transuranic elements

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actinide

Overview page. Subjects: Environmental Science.

Any of a series of radioactive elements that have an atomic number of between 89 and 103. Also known as actinoid.

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californium

Overview page. Subjects: Chemistry — Physics.

Symbol Cf. A radioactive metallic transuranic element belonging to the actinoids; a.n. 98; mass number of the most stable isotope 251 (half-life about 700 years). Nine isotopes are known;...

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Edwin Mattison McMillan

Overview page. Subjects: Science and Mathematics.

(1907–1991) American physicist

Born in Redonda Beach, California, McMillan was educated at the California Institute of Technology and at Princeton, where he obtained his PhD in...

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einsteinium

Overview page. Subjects: Chemistry — Physics.

Symbol Es. A radioactive metallic transuranic element belonging to the actinoids; a.n. 99; mass number of the most stable isotope 254 (half-life 270 days). Eleven isotopes are known. The...

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element

Overview page. Subjects: Chemistry.

A substance that cannot be decomposed into simpler substances. In an element, all the atoms have the same number of protons or electrons, although the number of neutrons may vary. There are...

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fermium

Overview page. Subjects: Chemistry — Physics.

Symbol Fm. A radioactive metallic transuranic element belonging to the actinoids; a.n. 100; mass number of the most stable isotope 257 (half-life 10 days). Ten isotopes are known. The...

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mendelevium

Overview page. Subjects: Chemistry — Physics.

Symbol Md. A radioactive metallic transuranic element belonging to the actinoids; a.n. 101; mass number of the first discovered nuclide 256 (half-life 1.3 hours). Several short-lived...

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neptunium

Overview page. Subjects: Chemistry — Physics.

Symbol Np. A radioactive metallic transuranic element belonging to the actinoids; a.n. 93; r.a.m. 237.0482. The most stable isotope, neptunium–237, has a half-life of 2.2 × 106 years and is...

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nobelium

Overview page. Subjects: Chemistry — Physics.

Symbol No. A radioactive metallic transuranic element belonging to the actinoids; a.n. 102; mass number of most stable element 254 (half-life 55 seconds). Seven isotopes are known. The...

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plutonium

Overview page. Subjects: Environmental Science.

A heavy, radioactive, metallic element (atomic number 94) that is similar to uranium. It undergoes fission when bombarded with neutrons and is used in the production of nuclear energy and...

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supertransuranics

Overview page. Subjects: Physics.

A set of relatively stable elements with atomic numbers around 114 and mass numbers of about 298 predicted to exist beyond the transuranic elements. In spite of the difficulties of...

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uranium

Overview page. Subjects: Science and Mathematics.

A silver‐coloured, heavy, radioactive metal that is found especially in pitchblende and uraninite, exists naturally as a mixture of three isotopes (U‐234, U‐235, and U‐238), and is used in...

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