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Q: What were the first three elements Johann grouped together?
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Was responsible for first grouping elements into triads based on similar properties?

Dobereiner was responsible for grouping element into triads. He grouped 3 element with same properties together.


Who discovered Neptune and when?

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.


When was amoeba discovered and by who?

August johann Rosel von Rosenhof was the first to discover amoeba in 1757.


Why lanthanum are grouped together in periodic table?

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.


What are the characteristic of the elements was used in early attempts to classify the elements according to their chemical similarities?

The elements were first arranged by the atomic mass of the elements in the first original table. Then it was arranged by atomic number.