Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract electrons towards itself within a chemical bond. This vital theoretical ...

A basic building block of matter. There are 118 chemical elements, 94 of which occur in nature. The additional 24 are created in labs. See rare earth elements and isotope. THIS DEFINITION IS FOR ...

Every field of science has its favorite anniversary. For physics, it’s Newton’s Principia of 1687, the book that introduced the laws of motion and gravity. Biology celebrates Darwin’s On the Origin of ...

Number 99 on the periodic table does not occur naturally and is difficult to make and store, challenging researchers who want to study it. By Kenneth Chang Einsteinium is an element with a famous name ...

Initially dedicated at the Lawrence Berkeley National Laboratory in Berkeley, California, on March 11, 2000. Rededicated at Lawrence Hall of Science in Berkeley on August 11, 2019, during the ...

THE reader's interest will be aroused even before he has opened this volume; for he will doubtless be curious to learn which members of the elemental series the author has decided to group together ...

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