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Atomic number, Element, and Symbol all serve independently as unique identifiers. Element names are those accepted by IUPAC . Block indicates the periodic table block for each element: red = s-block, yellow = p-block, blue = d-block, green = f-block.
The dagger symbol originated from a variant of the obelus, originally depicted by a plain line − or a line with one or two dots ÷. [7] It represented an iron roasting spit, a dart, or the sharp end of a javelin , [ 8 ] symbolizing the skewering or cutting out of dubious matter.
Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
Pol Pot [a] (born Saloth Sâr; [b] 19 May 1925 – 15 April 1998) was a Cambodian revolutionary and politician who was the dictator of communist Cambodia from 1976 until his overthrow in 1979. He oversaw mass atrocities and is widely believed to be one of the most brutal despots in modern world history.
Schematic representation of the flow of nitrogen compounds through a land environment See also: Nitrogen cycle Nitrogen is the most common pure element in the earth, making up 78.1% of the volume of the atmosphere [ 9 ] (75.5% by mass), around 3.89 million gigatonnes ( 3.89 × 10 18 kg ).
Shanghai becomes a symbol of the recent economic boom of China. Between 1999 and 2009, according to the World Bank statistics for GDP: [140] [141] The world economy by nominal GDP almost doubled in size from U.S. $30.21 trillion in 1999 to U.S. $58.23 trillion in 2009. This figure is not adjusted for inflation.