The Three-letter Element Symbols:

2016 ◽  
Vol 38 (2) ◽  
Author(s):  
Lars Öhrström ◽  
Norman E. Holden
Keyword(s):  
High School ◽  
Atomic Number ◽  
Periodic Table

AbstractWhen Lars Öhrström started paying real attention to chemistry, during his high school years in the early 1980s, the three-letter symbols then designating any element with atomic number higher than 103 seemed like a permanent fixture to the periodic table in the chemistry classroom. In the following years, he learned that they were only temporary placeholders for elements that fulfilled the criteria of “being discovered” but where, for unclear reasons, a name had not yet been agreed.

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

Students’ Perceptions about the Use of Educational Games as a Tool for Teaching the Periodic Table of Elements at the High School Level

2014 ◽  
Vol 92 (2) ◽  
pp. 278-285 ◽  
Author(s):  
Antonio Joaquín Franco-Mariscal ◽  
José María Oliva-Martínez ◽  
M. L. Almoraima Gil
Keyword(s):  
High School ◽  
Periodic Table ◽  
Educational Games ◽  
School Level ◽  
High School Level

scholarly journals The life and contributions to the periodic table of Glenn T. Seaborg, the first person to have an element named after him while he was still alive

2019 ◽  
Vol 91 (12) ◽  
pp. 1929-1939
Author(s):  
David Seaborg
Keyword(s):  
High School ◽  
Periodic Table ◽  
Southern California ◽  
First Person ◽  
High School Chemistry ◽  
Upper Peninsula ◽  
Physics Teacher

Abstract Glenn Seaborg was born on Michigan’s Upper Peninsula in 1912. At age 10, he moved to southern California, where his high school chemistry and physics teacher, Dwight Logan Read, sparked his interest in these fields. Seaborg was the first person to have an element named after him while he was still living. The only other person to have an element named after him while he was still alive was Yuri Oganessian.

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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