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Lead (/ l ɛ d /) is a chemical element; it has symbol Pb (from Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to ...
Some nonmetals (black P, S, and Se) are brittle solids at room temperature (although each of these also have malleable, pliable or ductile allotropes). From left to right in the periodic table, the nonmetals can be divided into the reactive nonmetals and the noble gases. The reactive nonmetals near the metalloids show some incipient metallic ...
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Periodic table extract showing the nonmetallic elements. H is normally placed over Li in Group 1. It is shown here over F for comparative purposes. The asterisks show further alternative positions for H. The elements shown as metalloids are those commonly recognized as such by authors who include such a class.
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.
solids are either ductile and malleable, hard and brittle, or soft and crumbly: a. ductile and malleable elements are metals; b. hard and brittle elements include boron, silicon and germanium, which are semiconductors and therefore not metals; and
Lead and cadmium were found in a majority of the protein powders that were tested. There is no safe level of lead, which has been linked to developmental disorders and high blood pressure.
Lead: Bismuth: Polonium: Astatine: Radon: Francium: ... Tin is a post-transition metal in group 14 of the periodic table of ... malleable, ductile and highly ...