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The Periodic Table03:25

The Periodic Table

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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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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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Physics is concerned with the interactions of energy, matter, space, and time, in order to discover the underlying mechanisms that underpin all phenomena. The word "physics" comes from the Greek word "phúsis", which means nature. Physics seeks to comprehend the natural world around us at its most fundamental level. It emphasizes the use of quantitative laws to do this, which could be valuable in other fields that want to push the performance boundaries of present...
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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
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The periodic table and the physics that drives it.

Peter Schwerdtfeger1,2, Odile R Smits3, Pekka Pyykkö4

  • 1Centre for Theoretical Chemistry and Physics, New Zealand Institute for Advanced Study and the Institute of Natural and Mathematical Sciences, Massey University Auckland, Auckland, New Zealand. p.a.schwerdtfeger@massey.ac.nz.

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The periodic table organizes elements by electron configuration, similar to particle physics. This framework helps predict properties and understand the origins of the heaviest elements using quantum chemistry and physics.

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Area of Science:

  • Chemistry
  • Physics
  • Quantum Mechanics

Background:

  • Mendeleev's periodic table revolutionized chemistry by ordering elements based on properties.
  • The periodic table's structure parallels the Standard Model in particle physics.
  • Quantum theory and its symmetries underpin the interactions described by these models.

Purpose of the Study:

  • To critically analyze the periodic table of elements.
  • To review the current status of theoretical predictions for the heaviest elements.
  • To explore the origins of the heaviest elements, integrating quantum chemistry and physics.

Main Methods:

  • Analysis of electronic configurations based on Pauli and Aufbau principles.
  • Consideration of relativistic effects and screening phenomena (e.g., lanthanide contraction).
  • Evaluation of nuclear stability, decay rates, and reaction cross-sections for transactinides.

Main Results:

  • Electronic configurations, relativistic effects, and nuclear stability influence element properties and predictions.
  • Anomalies in the periodic table arise from relativistic effects, screening, and complex electron configurations.
  • The heaviest elements present challenges due to configuration mixing and dense spectra.

Conclusions:

  • The periodic table provides a framework for predicting chemical and physical properties.
  • Understanding the heaviest elements requires integrating quantum chemistry, nuclear physics, and astrophysics.
  • Theoretical predictions and experimental studies are crucial for elucidating the origins of heavy elements.