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Period: to
Periodic Table Timeline
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the law of triads was put forward
Dobereiner's Periodic Table. A German scientist called Johann Dobereiner put forward his law of triads in 1817. Each of Dobereiner's triads was a group of three elements. The appearance and reactions of the elements in a triad were similar to each other. -
Silicon Discovered
Silicon was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1824 by heating chips of potassium in a silica container and then carefully washing away the residual by-products. Silicon is the seventh most abundant element in the universe and the second most abundant element in the earth's crust. -
law of octaves was put forward
Search Results An English scientist called John Newlands put forward his law of octaves in 1864. He arranged all the elements known at the time into a table in order of relative atomic mass. When he did this, he found that each element was similar to the element eight places further on. -
Law Of Octaves Put Forward
Read View History Edit Feedback law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements. Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law. -
Putonium Discovered
Glenn Seaborg (1912 - 1999) Glenn Seaborg was born in Michigan on April 19, 1912, and earned his Ph.D. at Berkeley in chemistry in 1937. He is best known for discovering the element plutonium with Edwin McMillan, in February 1941. -
Moseley's Law Put Forward
Moseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms. The law was discovered and published by the English physicist Henry Moseley in 1913.