General chemistry

General chemistry

Contributors in General chemistry

General chemistry

A chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of uranium or thorium. Its most stable ...

francium

Chemistry; General chemistry

A chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It has the lowest electronegativity of all known elements, and is the second rarest ...

radium

Chemistry; General chemistry

A chemical element with atomic number 88, represented by the symbol Ra. Radium is an almost pure-white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in color.

actinium

Chemistry; General chemistry

A radioactive chemical element with the symbol Ac and atomic number 89, which was discovered in 1899. It is a non-primordial radioactive element.

thorium

Chemistry; General chemistry

A natural radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 and named after Thor, the Norse god of thunder.

prtotactinium

Chemistry; General chemistry

A chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds ...

uranium

Chemistry; General chemistry

A silvery-white metallic chemical element in the actinide series of the periodic table, with atomic number 92. It is assigned the chemical symbol U. A uranium atom has 92 protons and 92 electrons, of ...