1) Elements 90 to 103 2) Radioactive elements
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This is a group of elements within the periodic table and are also known as the transuranics. The name refers to those elements with increasing atomic no. from actinium, which all have similar chemical properties, like the lanthanides. The first few membe
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http://www.chemicalglossary.net/definition/84-Actinides
Elements 90 to 103 (after actinium)
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http://www.chemistry-dictionary.com/definition/actinides.php
Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.
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Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. ... Synonym: actinide elements. ... Origin: actinium, first element of the series ... (05 Mar 2000) ...
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This is a group of elements within the periodic table and are also known as the transuranics. The name refers to those elements with increasing atomic no. from actinium, which all have similar chemical properties, like the lanthanides. The first few members of the group are the naturally occuring elements actinium, thorium, proactinium and uranium. Beyond this elements have been made artificially by radioactive bombardment. These artificial elements are unstable, some have very short lifeimes and undergo spontaneous radioactive decay.
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Actinides are a distinct transition group between actinium and lawrencium (inclusive). The group includes actinium, thorium , protactinium , uranium , neptunium , plutonium , americium , curium , californium etc. The members of the group are called actinides after the first in the series and they are all radioactive. Of the group, only thorium, ur....
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http://www.ionactive.co.uk/glossary_atoz.html?s=az&t=a
Type: Term Pronunciation: ak′tin-īdz Definitions: 1. Those elements with atomic numbers 89 to 103, below the lanthanides in the Periodic Table. Synonyms: actinide elements
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the row of elements below the periodic table, from thorium to lawrencium.
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https://www.encyclo.co.uk/local/22434
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