A periodic table based on atomic number and electron configuration. Where to place Th, Pa, and U in the table

1944 ◽  
Vol 21 (1) ◽  
pp. 25 ◽  
Author(s):  
Joseph A. Babor
Keyword(s):  
Atomic Number ◽  
Periodic Table ◽  
Electron Configuration

The Periodic Table: A Very Short Introduction

2019 ◽  
Author(s):  
Eric R. Scerri
Keyword(s):  
Quantum Mechanics ◽  
Atomic Number ◽  
Periodic Table ◽  
Chemical Elements ◽  
Chemical Properties ◽  
Electron Configuration ◽  
Short Introduction ◽  
Atomic Theory ◽  
Recent Advances

The periodic table of elements provides an arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties. The Periodic Table: A Very Short Introduction considers what led to the table’s construction and shows how the deeper meaning of its structure gradually became apparent with the development of atomic theory and quantum mechanics, which underlies the behaviour of all of the elements and their compounds. This new edition celebrates the completion of the seventh period of the table, with the ratification and naming of elements 113, 115, 117, and 118 as nihonium, moscovium, tennessine, and oganesson, and incorporates recent advances in our understanding of the origin of the elements.

scholarly journals CHEMICAL CHARACTER AND PHYSIOLOGICAL ACTION OF THE POTASSIUM ION

1920 ◽  
Vol 3 (2) ◽  
pp. 237-245 ◽  
Author(s):  
Jacques Loeb
Keyword(s):  
Atomic Number ◽  
Sea Urchin ◽  
Periodic Table ◽  
Chemical Behavior ◽  
Physiological Action ◽  
General Chemical ◽  
Li Ion ◽  
Chemical Character ◽  
Cs Ions ◽  
Salt Action

1. It is shown that the NH4 ion acts in cases of antagonism on the egg of Fundulus more like the K ion than the Na ion; this corresponds to the fact that in its general chemical behavior the NH4 ion resembles the K ion more closely than the Na ion. 2. It is shown that the tolerance of sea urchin eggs towards the Li ion can be increased 500 per cent or more if at the same time a certain amount of Na ion is replaced by K, Rb, or Cs ions. Since in the periodic table Na occupies a position between K and Li it is inferred that the Li and K ions deviate in their physiological action in the opposite direction from the Na ion. 3. These data indicate that the behavior of the K ion in antagonistic salt action (which forms the basis of the physiologically balanced action of ions) is due to its purely chemical character, i.e. its position in the periodic table or rather to its atomic number, and not to those explosions in its nucleus which give rise to a trace of radioactivity.

Discovery of the Element With Atomic Number Z = 118 Completing the 7th Row of the Periodic Table

2017 ◽  
Author(s):  
Paul J. Karol ◽  
Robert C. Barber ◽  
Bradley M. Sherrill ◽  
Emanuele Vardaci ◽  
Toshimitsu Yamazaki
Keyword(s):  
Atomic Number ◽  
Periodic Table

scholarly journals On the Regularity of the Electron Configuration of Atoms in the Periodic Table

2021 ◽  
Author(s):  
Toshihiro Konishi ◽  
Ryosuke Miura
Keyword(s):  
Energy Level ◽  
Chemical Reactions ◽  
Basic Principle ◽  
Periodic Table ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Electron Configuration ◽  
Transition Elements ◽  
Complex Chemical ◽  
Complex Chemical Reactions

Abstract The current periodic table does not necessarily have a clear position for transition elements. Therefore, the purpose of this paper is to use the basic principle discovered by Mendeleev as it is and to create a periodic ta ble with consistency for transition elements. By setting some hypotheses, it was found that transition elements also have regular periodicity, so we succeeded in clarifying the energy level of electrons in each orbit. In addition, by utilizing its periodic ity, the electron configuration for each orbit was predicted for unknown elements. In this paper, we did not take the conventional idea of electron orbitals, that is, the idea of forming a hybrid orbital, but assumed a new orbital.Since the state in which electrons fit in orbits and stabilize is defined as an octet, this idea was used as the basic principle in this paper, but the hypothesis that "there are only three orbits in each shell" was established and verified.The calculatio n of the energy level of the electrons on the orbit became extremely easy, and the order of each orbit could be clarified. It was also found that the three dimensional structure of the molecule may be visualizedby paying attention to the valence electrons of the outermost shell of the element and the octet of the stability condition. Therefore, in this paper, by slightly expanding the structural formula of Kekulé, it became possible to easily determine whether or not the molecule synthesized by the became possible to easily determine whether or not the molecule synthesized by the bond bebond between elements is stable.tween elements is stable. In addition, it has become possible to predict the three In addition, it has become possible to predict the three--dimensional structure of the dimensional structure of the molecule as well.molecule as well. Furthermore, not only will it be easier for students studying chemistry to understand Furthermore, not only will it be easier for students studying chemistry to understand complex chemical reactions, but it will complex chemical reactions, but it will also be useful for researchers in the development also be useful for researchers in the development and research of new drugs.and research of new drugs.

Heavy, Superheavy . . . Quo Vadis?

2018 ◽  
Author(s):  
Paul J. Karol
Keyword(s):  
Atomic Number ◽  
Periodic Table ◽  
Chemical Element ◽  
Chemical Elements ◽  
Chemical Properties ◽  
Superheavy Element ◽  
Electron Shell ◽  
Heavy Elements ◽  
Quo Vadis ◽  
Definition Of

Uranium was Discovered in 1789 by the German chemist Martin Heinrich Klaproth in pitchblende ore from Joachimsthal, a town now in the Czech Republic. Nearly a century later, the Russian chemist Dmitri Mendeleev placed uranium at the end of his periodic table of the chemical elements. A century ago, Moseley used x-ray spectroscopy to set the atomic number of uranium at 92, making it the heaviest element known at the time. This chapter will deal with the quest to explore that limit and heavy and superheavy elements, and provide an update on where continuation of the periodic table is headed and some of the significant changes in its appearance and interpretation that may be necessary. Our use of the term “heavy elements” differs from that of astrophysicists who refer to elements above helium as heavy elements. The meaning of the term “superheavy” element is still not exactly agreed upon and has changed over the past several decades. “Ultraheavy” is occasionally used. Interestingly, there is no formal definition of “periodic table” by the International Union of Pure and Applied Chemistry (IUPAC) in their glossary of definitions: the “Gold Book.” But there are plenty of definitions in the general literature—including Wikipedia, the collaborative, free, internet encyclopedia which calls the “periodic table” a “tabular arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations (electron shell model), and recurring chemical properties. Elements are presented in order of increasing atomic number (the number of protons in the nucleus).” IUPAC’s first definition of a “chemical element” is: “A species of atoms; all atoms with the same number of protons in the atomic nucleus.” Their definition of atom: “the smallest particle still characterizing a chemical element. It consists of a nucleus of positive charge (Z is the proton number and e the elementary charge) carrying almost all its mass (more than 99.9%) and Z electrons determining its size.”

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