1910

Hello my name in Henry Moseley Ihelped and contributed to the production of the common periodic table along with Dimitri Mendeleev. In my research i have proved that the charge of the nucleus is equal to the atomic number. I feel that the vibration of each x ray put out by an element bombarded with cathode rays shows the relation to its atomic number. I have made my elements arranged by the atomic number almost exactly the same as Mendeleev's table but his is measured by the atomic weight. Later on after his death i have made changes and acommidated for isotopes and rare gases and any other missed elements. This is my blog about my contribution to the now famous and almost nessecity to the chemistry world the periodic table.

1909

Gold Foil Experiment




The gold foil experiment was an experiment that was supposed to help scientists learn more about alpha particles. In this experiment however the scientists wanted to measured the deflection of alpha particles directed onto a thin gold foil. It was hope that the particulars would be deflected by just a few degrees. Particles were radioactive when they were fired through the minutely thin metal foils. The particles were to be detected by using screens coated with zinc sulfide also known as a scintillator.
The experiment was directed by Ernest Rutherford and conducted by Hans Geiger and Ernest Marasdan in 1919 after the conclusion of the gold fold experiment. Rutherford found that although the vast majority of particles passed straight through the foil, approximately 1 in 8000 were defected leading him to the theory that most of the atom was made up of empty space. The reason why the particles were defected was because there was a very small positive charge which could repel the alpha particles if they came close enough. In 1911 Rutherford made a model of the atom which he named after himself.

1907

Good Day,

This is Dmitri Mendeleev's son, Vladimir. My father was an important chemist, but unfortunately he just passed. I decided to post some of his journal entries on this Internet. But i will begin by giving you a brief biography. My father was born on February 8, 1834 in Tobolsk, Siberia. He was the youngest of 18 children. When he was 13, his father died and his mothers factory burned down. Also he attended the Gymnasium (school) in Tobolsk. In 1849, his family moved to St. Petersburg, where he attended the Main Pedagogical Institute in 1850.
In 1861, he wrote his first book about a machine called the spectroscope. In 1862, my father married his first wife, Feozva Nikitichna Leshcheva. He divorced her and married his second wife, Anna Ivanova Popova, in 1882. He is one of the people credited for the creation of the modern periodic table, but i will get into that later. My father died in 1907 in St. Petersburg freom influenza.

1869

Periotic Table

I was best known for my work on the periodic table, which was arranging the 63 known elements into a periodic table based on the atomic mass. This idea was published in my book called Principals of Chemistry in 1869. Although my periodic table would be modified a number of times. One person in particular who did modify the periodic table was Henry Moseley. The table was meant to accommodate the discovery of isotopes and rare gases. In the beginning I provided the variance from strict atomic weight order. During the time I was creating the periodic table I predicted three yet to be discovery elements including eke silicon and eke boron. Three of the elements were found during scandium, germanium and lifetime gallium.