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Recognition status, as metalloids, of some elements in the p-block of the periodic table. Percentages are median appearance frequencies in the lists of metalloids. [n 1] The staircase-shaped line is a typical example of the arbitrary metal–nonmetal dividing line found on some periodic tables.
The free element is remarkable for its robustness, especially the fact that it has the highest melting point of all known elements, melting at 3,422 °C (6,192 °F; 3,695 K). It also has the highest boiling point, at 5,930 °C (10,706 °F; 6,203 K). [13]
The trioxide [24] [47] and trisulfide can both be made from the elements, [48] [35] although the trioxide is extremely corrosive at high temperatures. [36] The pentoxide is not stable at room temperature, and will evolve O 2 gas if heated. [49] Both oxides form complex anions, [50] [51] and NaBiO 3 is a strong oxidising agent. [51]
It is a strong metal with low density that is quite ductile (especially in an oxygen-free environment), [9] lustrous, and metallic-white in color. [17] Due to its relatively high melting point (1,668 °C or 3,034 °F) it has sometimes been described as a refractory metal , but this is not the case. [ 18 ]
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.
Most processes using free fluorine in large amounts employ in situ generation under vertical integration. [ 184 ] The largest application of fluorine gas, consuming up to 7,000 metric tons annually, is in the preparation of UF
Niobium is a lustrous, grey, ductile, paramagnetic metal in group 5 of the periodic table (see table), with an electron configuration in the outermost shells atypical for group 5. Similarly atypical configurations occur in the neighborhood of ruthenium (44), rhodium (45), and palladium (46).
They are denser than the strontium or calcium analogs, except for the halides (see table; zinc is given for comparison). Barium hydroxide ("baryta") was known to alchemists, who produced it by heating barium carbonate. Unlike calcium hydroxide, it absorbs very little CO 2 in aqueous solutions and is therefore insensitive to atmospheric ...
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