General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

A chemical element, Es, atomic number 99, a member of the actinide series in the periodic table. It is not found in nature but is produced by artificial nuclear transmutation of lighter elements. All ...

europium

Science; General science

A chemical element, Eu, atomic number 63, atomic weight 151.96, a member of the rare-earth group. The stable isotopes, 151 Eu and 153 Eu, make up the naturally occurring element. The metal is the ...

fluorine

Science; General science

A chemical element, F, atomic number 9, the member of the halogen family that has the lowest atomic number and atomic weight. Although only the isotope with atomic weight 19 is stable, the other, ...

iron

Science; General science

A chemical element, Fe, atomic number 26, and atomic weight 55.847. Iron is the fourth most abundant element in the crust of the Earth (5%). It is a malleable, tough, silver-gray, magnetic metal. It ...

fermium

Science; General science

A chemical element, Fm, atomic number 100, the eleventh element in the actinide series. Fermium does not occur in nature; its discovery and production have been accomplished by artificial nuclear ...

francium

Science; General science

A chemical element, Fr, atomic number 87, an alkali metal element falling below cesium in group 1 of the periodic table. Distinguished by nuclear instability, francium exists only in short-lived ...