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Elements , CONCEPT
The elements are at the heart of chemistry, and indeed they are at the heart of life as well. Every physical substance encountered in daily l… Atomic Clock , Atomic clocks are the world's most accurate time keepers—more accurate than astronomical time or quartz clocks. Originally, a second was defined as 1… actinide series , ACTINIDES
CONCEPT
The actinides (sometimes called actinoids) occupy the "bottom line" of the periodic table—a row of elements normally separated from… Berkelium , Berkelium (revised)
Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
Overview
In the period between 1940… Isotopes , CONCEPT
Isotopes are atoms of the same element that have different masses due to differences in the number of neutrons they contain. Many isotopes ar… Actinide Series , Actinides or actinoids is a generic term that refers to a series of 15 chemical elements. Denoted by the generic symbol An, these elements are all ra…
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