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The Periodic Table03:25

The Periodic Table

110.8K
As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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Overview
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The Periodic Table and Organismal Elements01:27

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Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Periodic Classification of the Elements04:00

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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System
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Development of Bonding Models Based on the Periodic Table.

D P Michael Mingos1

  • 1Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, UK ;,

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PubMed
Summary
This summary is machine-generated.

The isoelectronic principle, established in 1919, links compounds with identical electron counts. This concept connects the Periodic Table to modern valence theory, aiding inorganic chemists in exploring chemical properties.

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Area of Science:

  • Chemistry
  • Chemical Bonding
  • Periodic Trends

Background:

  • Kossel and Lewis (1916) connected the Periodic Table to valence theory through ionic and covalent bonding.
  • Langmuir (1919) observed similar properties in neutral molecules with the same number of electrons (isoelectronic species).

Purpose of the Study:

  • To highlight the historical significance of the isoelectronic principle.
  • To demonstrate its utility in inorganic chemistry for understanding chemical relationships.

Main Methods:

  • Review of historical chemical bonding theories.
  • Analysis of Langmuir's isoelectronic principle and its applications.

Main Results:

  • The isoelectronic principle provides a framework for comparing diverse compounds.
  • It facilitates the exploration of Periodic Table implications in chemical properties.

Conclusions:

  • The isoelectronic principle remains a valuable tool for inorganic chemists.
  • It bridges historical bonding concepts with modern chemical understanding.