Mendeleev’s periodic table contributions

-


DIMendeleevCab.jpg
Dmitri Mendeleev, born 8 February 1834, was a russian chemist and inventor often credited with the formulation of the periodic table, one that is continuously used in science to this date. Mendeleev, however, did not create the periodic table from scratch, rather he improved on pre-existing notions to create one that would not be in error as new elements were discovered.

Through deduction, Mendeleev realised that the relative atomic mass and properties of an element occur periodically, and many of these properties, when the elements are arranged by their atomic mass, repeat themselves, such as chemical properties of Lithium recurring in Sodium such as their reactivity with water, and once again in Potassium later on. This lead to the creation of the Periodic Law. This law, initially, was only an empirical concept and could not be proven, it was merely suggested in research done by scientists at the time. Technological advancements today and the development of the electronic theory of atomic structure lead to a better theoretical understanding of the phenomenon.

One of Mendeleev’s greatest accomplishments was his ability to not impose his own views of how he believed elements should behave to the periodic table. While other periodic tables failed, he made his own perdurable by only using elements that were better known, and leaving gaps in his periodic table to where he predicted other elements would have to appear. Mendeleev’s foresight generated a periodic table which could adapt to new elemental discoveries. His method of arrangement and knowledge of how elements behave due to their properties also allowed for him to predict elements that were not yet discovered - and their properties, with a significant degree of accuracy. For example, Mendeleev predicted the existence of gallium, an element that should fit below aluminium in his periodic table. When gallium was actually discovered in 1875, it pertained many of the properties that Mendeleev predicted before. Other elements that were later discovered supported Mendeleev’s table, giving it more credit. Below, you can see a snippet of what his periodic table looked like in 1871. Also, be sure to give this video a watch:
A TED-ed talk which explains Mendeleev’s genius further.

Image result for Mendeleev table
References:

“Mendeleev Periodic Table.” Study.com,

.
.

Comments

Post a Comment

Popular posts from this blog

Everyday application of Hess's Law

-
Image
  Everyday application of Hess's Law Burning calories, consuming food, driving home, we all should be familiar with these actions because we do them everyday, but what some of us don't realise is that all these actions related one fundamental law of conservation of energy, Hess's Law.   Hess's Law states that: regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. [1]   We will further discover how our indrustries, human body and drug production are related to this law and to better understand the science behind it. Industries Today, all our mass and low cost production depends on factories and industries and all these industries require huge amount of energy.   To keep everything the most efficient possible, these industries has to determine the method that is the most effective to produce a product based on the energy needed or released.   For example:  Car companies must determine ho
Read more

Antoine Lavoisier and his contribution to Chemistry

-
Image
The French Bourgeoisie helping out with science: “In performing experiments, it is necessary… that they be simplified as much as possible, and that every circumstance that could complicate the results should be completely removed.” -Antoine Lavoisier Early life and Work: On the 26 of  August 1743, Antoine Lavoisier was born to a wealthy family of nobility and was the son of an attorney at the Parliament of Paris. He  went to school at the College des Quatres Nations, University of Paris at the age of 11 were he studied chemistry, botany, astronomy and mathematics and received a law degree which admitted him the bar. (1). This French nobleman, chemist and biologist is credited for being the first one to put an extensive lists of the elements, helping construct the metric system and reform chemical nomenclature. Lavoisier is also known as the “ father of modern chemistry” (1). Lavoisier who was originally part of the Ferme generale ( most hated components of the F
Read more

Are physical properties such as temperature invented or discovered?

-
Image
TOK Blog Are physical properties such as temperature invented or discovered? Even tho we don’t know exactly how temperature was invented or discovered we know for sure the Galileo Galilei was the first human being that came up with the idea of an instrument able to calculate the temperature know as a thermometer. Many scientist don’t really recognize Galilei’s instrument as a thermometer but, more as thermoscope because his device only showed the change in temperature and had no scale .The measurement of temperature consist of “The process of measuring a current local temperature for immediate or later evaluation.” Celcius In 1742 two years before his death Celcius created a scale which was reversed a 0° represented the boiling point of water and 100° represented the freezing point of water. Kelvin In 1848, William Thomson created the Absolute Thermometric Scale that could measure the absolute zero as the scale's null point, and in which he used the Celsius as
Read more