What is Richard Abegg famous for?
Born on 9 January 1869 in Danzig, Prussia (now Gdańsk, Poland), Richard Abegg was a chemist who is best known for his research into valence. He received his doctorate from the University of Berlin in 1891.
When did Abegg make his discovery?
In 1904, he proposed an important rule concerning chemical valence: According to Abegg’s rule, the difference between the maximum positive and negative valence of an element is eight [1]. The concepts of negative and positive valence at the time were used similarly to positive and negative oxidation states today.
What did Richard Abegg contribute to the atomic theory?
Atomic Theory. Richard Abegg (1869-1910), a German chemist concluded that the Noble gases (i.e., Argon) were stable because there was 8 electrons in the outermost shell. If that is true, then maybe the electrons of other elements exchanged electrons to create a stable molecule.
What did Richard Abegg do?
Richard Wilhelm Heinrich Abegg (January 9, 1869 – April 3, 1910) was a German chemist and pioneer of valence theory. He proposed that the difference of the maximum positive and negative valence of an element tends to be eight. This has come to be known as Abegg’s rule.
What did John Dalton Discovery?
Dalton’s experiments on gases led to his discovery that the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space. In 1803 this scientific principle officially came to be known as Dalton’s Law of Partial Pressures.
What did Henry Moseley study?
His first researches were concerned with radioactivity and beta radiation in radium. He then turned to the study of the X-ray spectra of the elements. In a brilliant series of experiments he found a relationship between the frequencies of corresponding lines in the X-ray spectra.
What did Rutherford discover in his experiment?
Rutherford’s gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
What is Moseley’s staircase?
Film Clip: Moseley’s Staircase – To Moseley’s surprise, when he lays out the spectra of consecutive elements, they rise in frequency, step by step, forming a striking pattern that comes to be known as “Moseley’s staircase.” The pattern reveals an amazingly simple relationship between an element’s X-ray spectrum and its …
When did Rutherford make his discovery?
1911
May, 1911: Rutherford and the Discovery of the Atomic Nucleus.