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Dobereiner was responsible for grouping element into triads. He grouped 3 element with same properties together.
Neptune was predicted by mathematical calculations and first observed on Sept 23, 1846 by Johann Galle, Urbain Le Verrier and John Couch Adams. This was the first time Neptune was observed, as it is not visible with the naked eye.
August johann Rosel von Rosenhof was the first to discover amoeba in 1757.
The question is not phrased quite right -- lanthanum is a single element. It is the first of a group of 15 elements called "lanthanides", atomic numbers 57-71. They are caused by a pause in the usual periodic progression of electron orbital filling with increased atomic number, where electrons go into a shielded inner 4f orbit instead of the outermost shell. As a result, the chemical properties don't change much from element to element. Thus the lanthanides occur together in nature and are difficult to separate chemically. Most of the lanthanides were first discovered in ore from Ytterby, Sweden, thus they have names derived from that place. Together with two other lighter elements, scandium and yttrium (which have similar chemical properties), they are known as the "rare earths" although most of them are only semi-rare.
The elements were first arranged by the atomic mass of the elements in the first original table. Then it was arranged by atomic number.
MOSLEY
Dobereiner was responsible for grouping element into triads. He grouped 3 element with same properties together.
Johann Wolfgang Döbereiner
the periodic table is grouped according to similarities. when Mendeleev grouped his first periodic table they followed a pattern. any elements that contained similarities they were all put into the same column.
yes, he had 20 kids all together...7 with his first wife and 13 with his second wife.
Johann Phinninger was the first president in the canton of Zurich, Switzerland.
Printable CD's were first introduced in the 1974's where engineers grouped together in order to try and engineer something to hold data that was compact.
It was Johann Friedrich GutsMuths It was Johann Friedrich GutsMuths
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