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5 Αυγ 2018 · Properties. Radium is an alkaline earth metal. Radium has a melting point of 700°C, boiling point of 1140°C, specific gravity estimated to be 5, and valence of 2. Pure radium metal is bright white when freshly prepared, although it blackens upon exposure to air. The element decomposes in water.
Some elements exist in several different structural forms, called allotropes. Each allotrope has different physical properties. For more information on the Visual Elements image see the Uses and properties section below.
28 Σεπ 2024 · Radium is a radioactive chemical element that is the heaviest of the alkaline-earth metals of the periodic table. Radium is a silvery white metal that does not occur free in nature. Its most characteristic property is its intense radioactivity, which causes compounds of the element to display a faint bluish glow in the dark.
Radium is the heaviest known alkaline earth metal and is the only radioactive member of its group. Its physical and chemical properties most closely resemble its lighter congener, barium. [3] Pure radium is a volatile, lustrous silvery-white metal, even though its lighter congeners calcium, strontium, and barium have a slight yellow tint. [3]
Physical characteristics. Radium is a radioactive element of the alkaline earth series of metals. Radium is silvery, lustrous, soft and radioactive element. Its atomic symbol Ra, atomic number 88, atomic weight 226, solid at room temperature. Melting point 700 C and boiling point 1140 C.
11 Νοε 2023 · Learn about the discovery, appearance, properties, isotopes, uses, and health effects of radium, a radioactive metal with atomic number 88 and element symbol Ra. Find out how radium glows in the dark, how it is used in medicine and research, and why it is toxic and rare.
Physical and chemical properties of Radium: general data, thermal properties, ionization energies, isotopes, reduction potentials, abundance of elements, crystallographic data.
