Henry Moseley

Henry Moseley experimented with energy in particles. He showed that high potential was attainable from a radioactive source of radium, which leaded to the first atomic battery. Moseley observed and measured the x-rays spectra of chemical elements (mostly metals) that were found by the method of diffraction. Before Mosley's discovery, the atomic numbers of an element had been based on atomic masses(on the periodic table made by Dmitri Mendeleev). Moseley s experiments showed that each element had a different atomic number based on their x-ray spectra. In addition, Moseley showed that there were gaps in the atomic number sequence at numbers 43, 61, 72, and 75.

Henry Moseley

Life and Death

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Tho Henry Moseley added a crucial part to the periodic table, the table was still not complete. It was further modernized by a man named Harry D. Hubbard

Henry Mosely ( A.K.A Harry) was born on November 23, 1887 in a small town called Weymouth in England. As he was young, Henry attended Summer Fields School (in England) and was a very promising student. He then earned a scholarship to attend Eton college (also in England) where in 1906 he won the chemistry and physics prizes. In 1906, Moseley entered Trinity College of the University of Oxford, where he earned his bachelor's degree.Immediately after graduation from Oxford in 1910, Moseley became a demonstrator in physics at the University of Manchester. One of his mentors was Sir Ernest Rutherford who also supervised him.

Parents

His father Henry Nottidge Moseley (1844–91), who died when Henry Moseley was quite young, was a biologist and also a professor of anatomy and physiology at the University of Oxford. His mother was Anabel Gwyn Jeffrey Moseley who was the daughter of John Gwyn Jeffrey. Both parents were highly educated and very wealthy.

Pt.2

During Mosley's first year at Manchester he worked as a teaching assistant but following that first year, he was reassigned from his teaching duties to work as a research assistant. He declined a fellowship offered by Rutherford, instead he planned to move back to Oxford, in November 1913, where he was given laboratory facilities but no support. On August 10, 1915 Henry died at the age of 27.

Contribution

Before Moseley and his law, atomic numbers had been thought of as a semi-arbitrary ordering number, vaguely increasing with atomic weight but not strictly defined by it. Mosley's discovery showed that atomic numbers have a physical basis. Moseley defined the idea of an atomic number to elements to make the periodic table exact.He showed that the periodic table is best organized by atomic number. He did this all because of use of the X-ray spectrometer.

What he did

Topics

1.Life and Death

2.His Work

3.Contribution

One Challenge

While in the middle of his brilliant work (after his discoveries), WW1 broke out and Henry volunteered to fight in the trenches. To a slight surprise the reason why he died at such a young age was because he was shot in the head while in the trenches by enemy bullet which fatally killed him.