Atomic structure, Moles and Periodicity
The Periodic Table is guidance or map to access different elements specific information, such as: atomic mass, isotopic richness, nuclear spins, electronic configuration and the position of elements belong to which group and period in table. Over the past decades there were many Scientifics which help to improvement of Periodic table but few of them made the most influence and contribution on Periodic table such as : Johann Dobereiner ,John Newlands , Dmitri Mendeleev and Henry Moseley.
Law of Triads
The development of Periodic table begins with the German chemist Johann Dobreeiner. He collected similar elements together. His triads were groups of three similar elements for example: Calcium,
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He continued his way and put forward the elements in order of increasing atomic mass and wherever he found a interval, simply assumed that this elements had not discovered yet. His way helped him to work out the atomic mass of undiscovered elements and predict their properties which the later on the new elements discovered it could go to the right place in his table. He put the elements in order of relative atomic mass and this gave a problem. For example: Iodine with lower atomic mass was after Tellurium in table and that breaking his rules.
Modern Periodic table
Henry Moseley came and put the elements in order of increasing atomic number. Actually Mendeelv was right to put Iodine after Tellurium but he did not know why is like this, but in Henry Moseley way iodine has higher atomic number than tellurium so iodine must be after tellurium in table.
In the modern periodic table vertical column called Group. There are 8 groups in periodic table which some of groups have names as well for example group seven named as Halogens or group eight (0) named as Noble gases. Groups often show an increase or decrease in similar properties. Elements in each group contain of same electron configuration in the outermost shell. A horizontal row called period, and they numbered from top to downwards 1-7. The periods consist of elements with the same
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.
Mendeleev knew that there would be elements that would fill the entire table, but they were not yet discovered, so he left their spots blank. He organized the table by their increasing atomic mass. In this lab, our job was to mix unknown solutions with known solutions and record what happened once they were mixed. Once we completed our objectives for the lab, we were to group the solutions with similar characteristics like Mendeleev did when he was organizing his table. Unlike Mendeleev, we did not group ours with atomic mass.
The Disappearing Spoon written by author Sam Kean, is a book in where it talks about how the elements from the periodic table play a huge role into where we stand today. Kean digs deep down into where and how these elements were discovered or created. From the stories of the elements he can tell the reader how it led to other stories of science, history, finance, mythology, the arts, medicine, and more Ch. 1 In Geography is Destiny, the author Sam Kean begins by going into the organization of the periodic table.
The purpose of the lab was to mimic the way Mendeleev placed the elements on the periodic table. Mendeleev was a Russian chemist who produced the first orderly periodic table. Frist, the way the periodic table has been classed alongside the atomic sum and the elements with related properties. Second, the objectives are observeing the physical states of common elements, and the progression of the periodic table, lastly speculate by determining the unknown elements established on the observed progression. As a group we tried to find out where the unknown elements should be placed. Finnly, the information that was given to help us with our process was the state, density, hardness, conductivity, melting point, and color.
Chapter 12 of Kean’s bestseller focuses on how politics had a major influence on the development of the periodic table. The majority of the chapter takes place during the mid-1900s and therefore, as one might
Chapter one of The Disappearing Spoon informs us of the information hidden in the periodic table, and why the periodic table is arranged the way it is. Through its pages it explained the formation of the periodic table such as its shape, trends, and etc. The pages also tie into one or more learning goals in this unit. A periodic table is not just a chart with things splashed onto it, it is a chart that was thoroughly arranged based on the trends, the characteristics, the description, and formation of an element.
-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the
I came to the conclusion that they should appear (Cl, Br, I) from top to bottom respectively. Based on the previous information regarding mass increases as you go down the periodic table I was able to come to this conclusion. I observed that Cl had the least color concentration, then Br, then I had the most. The greater the color concentration, the greater the mass. This observed data let me come to my conclusion.
By firing massively charged particles at an atom, he found that atoms are made up of smaller particles (Doc. 1). This would lead to his discovery of protons also known as alpha particles (OI). After that, he bombarded gold foil and observed that some of the atoms passed through the foil. Therefore, he concluded that atoms are composed of empty space (OI).
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.
Periodic Table and Periodic Law Experiment Date: March 16, 2017 20170004 강동현 Co-worker: 박정언 Introduction In 1869, Dmitri Mendeleev and Lother Meyer separately made the periodic table, which showed that the properties of chemicals recur periodically. However, both periodic tables sorted the elements in order of increasing atomic mass.
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.
Vocabulary: atomic number, atomic radius, Aufbau principle, chemical family, diagonal rule, electron configuration, Hund’s rule, orbital, Pauli exclusion principle, period, shell, spin, subshell
The Discovery of the Atom first came from the Greeks which made a theory “The idea that all matter is made up of tiny, indivisible particles, or atoms, is believed to have originated with the Greek philosopher Leucippus of Miletus and his student Democritus of Abdera in the 5th century B.C. (The word atom comes from the Greek word atomos, which means “indivisible.”)” (InfoPlease Atomic theory)
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