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Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.
Speed of sound thin rod: 2830 m/s (at 20 °C) Poisson ratio: 0.237 : Vickers hardness: 430–700 MPa : Brinell hardness: 600–1070 MPa : CAS Number: 7440-52-0 : History; Naming: after Ytterby (Sweden), where it was mined: Discovery: Carl Gustaf Mosander (1843) First isolation: Wilhelm Klemm and Heinrich Bommer (1934) Isotopes of erbium
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Ruthenium is the only 4d transition metal that can assume the group oxidation state +8, and even then it is less stable there than the heavier congener osmium: this is the first group from the left of the table where the second and third-row transition metals display notable differences in chemical behavior.
This was the culmination of the Russia–US collaboration on the synthesis of the heaviest elements on the periodic table. Berkelium is a soft, silvery-white, radioactive metal. The berkelium-249 isotope emits low-energy electrons and thus is relatively safe to handle.
It is the first element in group 12 (IIB) of the periodic table. In some respects, zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn 2+ and Mg 2+ ions are of similar size. [b] Zinc is the 24th most abundant element in Earth's crust and has five stable isotopes.
Lavoisier writes the first modern list of chemical elements – containing 33 elements including light and heat but omitting Na, K (he was unsure of whether soda and potash without carbonic acid, i.e. Na 2 O and K 2 O, are simple substances or compounds like NH 3), [90] Te; some elements were listed in the table as unextracted "radicals" (Cl, F ...