How many chemical elements are there in the series of "Actinide"?
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"Actinide" is a group of 15 chemical elements with similar chemical properties and has the atomic number from 89 to 103. Their names are Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium. Actinides are radioactive elements and release energy upon radioactive decay.
To read more about Actinide, follow this link: http://en.wikipedia.org/wiki/Actinide#Discovery.2C_isolation_and_synthesis
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