Dmitri Mendeleev Original Periodic Table Essay

For the lesson observed the objectives was to explain the trends of the periodic table based on the elements’ valence electrons and atomic numbers. Additionally, students were responsible for applying their previous knowledge in calculating subatomic particles to review the Bohr Models and discus the relationship among families in the periodic table. Students will use the information from today’s lesson to make future judgments on reactivity and bonding created during chemical reactions in the next unit. Lastly, students were to connect the information on elemental properties to previous experiences with their health, commercial products, and everyday life.

Page 12 of The Disappearing Spoon ties into learning goal 20. It introduces the idea of columns and rows in the periodic table, and the castle like shape of the periodic table. “Sort of looks like a castle, with an uneven main wall...defensive turrets on both ends...eighteen jagged columns [also called groups] and seven horizontal rows [also called periods], with a ‘landing strip’ of two extra rows hanging below...made of ‘bricks’.” This quote from the book clearly explains the shape of the periodic table and its arrangement.

John Dalton wrote the modern atomic theory, a fundamental component of that is, the mole ratios of elements in a compound will be small whole numbers.

The students created a macroscopic, three-dimensional (3D) model of several properties of the periodic table. They explained in their own words the following terms: atomic radii, ionic radii, first ionization energy, and electronegativity. Lastly, they identified, described, and explained the patterns observed in the 3D periodic tables for the following element properties: atomic radii, ionic radii, first ionization energy, and electronegativity.

33. Electron dot model is a way of representing the valence electron of an atom.

-Dmitri Mendeleev- first periodic table, organized 63 known elements according to properties, organized into rows and columns and wrote name, mass, and chemical properties on each

The second main contributor toward the atomic structure was John Dalton. John Dalton was the one who brought the atomic theory talk back into play after 2000 years from Democritus. Dalton become fond of the atomic structure following his love from meteorology. He claimed that the forces of repulsion that caused pressure only were between the same atoms and the atoms inside a mixture had different weights and complexity. He then decided to calculate the atomic weights by determining the percentages of each composition in a compound. This allowed him to be able to

In final analysis, the electronegativity and density periodic trends trends are fairly consistent. Electronegativity decreases when going down groups, while density increases. However, the outliers of these trends are the noble gases, because of their stable, unreactive properties. In addition to helping students learn about periodic trends, it also demonstrated to students how these trends were of great use for previous scientists when they worked together to discover new elements that were missing on the periodic

The book “The Periodic Table” by Primo Levi is undoubtedly a masterpiece. It showcases the enthusiasm, the level of dedication, and passion successful chemists such as Primo Levi himself had for the field of their expertise. The way Primo Levi has related the troublesome times and events he had to face in prospect with the elements of the periodic table is laudable. Primo Levi is surely an inspiration and a perfect example of prodigy and passion. Despite the challenges and the hardships inflicted on him by the bigoted group of Germens, he still managed to emerge as an exceptional chemist and an author who made great contributions to the modern chemistry as we now know it.

Over the course of the last 5000 years, mankind’s knowledge has been constantly advancing. Chemistry, a branch of science, has experienced a tremendous leap and expansions since ancient Greek civilization. One of the major breakthroughs in the advancement in Chemistry was the creation of the Atomic theory, which laid a foundation for the modern-day Chemistry and future of science. The Atomic theory introduced the idea of atoms, which are defined as the discrete units of matter. There are five key scientists that significantly contributed to the Atomic model over a span of thousands of years. They are: Democritus, John Dalton, J.J. Thompson, Ernest Rutherford, and Niels Bohr.

It made finding the elements easier and it was able to be altered for the better of the science community. His table was able to accurately predict the “missing” elements in his chart. Mendeleev was very successful in his scientific career after he created the periodic table and is most famous for that discovery. Mendeleev’s periodic table had some flaws, but he used his periodic table to: • Propose that some of the elements, whose behavior did not agree with his predictions, must have had their atomic weights measured incorrectly. • Predict the existence of eight new elements.

Mendeleev produced the first precise periodic table, “Mendeleev wrote symbol for each element, along with the physical and chemical properties and the relative atomic mass”(117). Mendeleev placed the elements in order by its physical properties including the atomic mass number and started a new row if the elements were equivalent. Due to his organization of the elements it was impossible for the unknown elements to be placed in a wrong location “Mendeleev was the first to predict the existence of undiscovered elements...most chemists accepted his periodic table of

- The discovery of neutrons solved the mystery why atomic mass and atomic number are different, since neutrons added mass to the atom but don’t add any

For each element, we believe that its mass and atomic number have a positive linear relationship. We can expect that as the atomic mass increases, the mass of the gas will increase as well.

It is set up so it is easily read and understood. In the novel, the periodic table is referred to as the Periodic Pier. Alice was thinking of the atoms she had seen before and was now seeing them again. “Maybe those are the same atoms which I am seeing differently. I suppose that instead of the Periodic Pier, that would make this the Periodic Table (Gilmore 118).” As Alice goes through Quantumland and learns of all the elements, and atomic mass it is easy to relate to. We have spent great amounts of time this year, and last year learning all about the periodic table and the elements involved with