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The Copper Age sits between the Neolithic (Stone) and Bronze Ages.

It took place at different times in different cultures, when people began using copper tools alongside stone tools.

Hahn and Meitner were searching for a ‘mother substance’ that decayed to actinium.

Four allotropes of carbon are known: amorphous (e.g., charcoal and soot), graphite, diamond and fullerenes.

If you need to cite this page, you can copy this text: Kenneth Barbalace. Accessed on-line: 8/12/2017https://Environmental Chemistry.com/yogi/periodic/ If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:echo Periodic Table of Elements: Sorted by Ionic Radius (Environmental Chemistry.com)- This site offers comprehensive information for each element including: who, when & where; up to 40 properties (chemical & physical); over 3,600 nuclides (isotopes); over 4,400 nuclide decay modes; the element names in 10 different languages; and more.

Periodic Table of Elements - Sorted by Ionic Radius. In addition chemistry and technical terms are linked to their definitions in the site's chemistry and environmental dictionary..

Carbon’s small size allows it to form multiple bonds with many other small atoms, including carbon atoms, and is prevalent in a large number of chemical compounds.

Carbon-based compounds are the basis for all living systems and comprise the structure of fossil fuels in the form of hydrocarbons. The International Union of Pure and Applied Chemistry designated the isotope C-12 as the basis for atomic weights, while the unstable isotope C-14, with a half-life of 5700 years, is used for carbon dating.

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    Exploratory analysis of the international radiocarbon cross- calibration data: consensus values and interlaboratory error.