Uranium: Heaviest natural element. From: The Times of India (New Delhi, India) | Date: February 7, 2005 | COPYRIGHT 2005 The Times of India. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Feb. 7--WHAT IS URANIUM?

Uranium is a radioactive element that occurs naturally in low concentrations (a few parts per million) in soil, rock, and surface and groundwater. It is the heaviest naturally occurring element, with an atomic number of 92. Uranium in its pure form is a silver-colo-ured heavy metal that is nearly twice as dense as lead. In nature, uranium atoms exist as several isotopes. A sample of natural uranium (as mined) is composed of 99.3 percent uranium-238, 0.7 percent uranium-235 (the isotope essential for nuclear weapons), and a negligible amount of ...

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