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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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Elements: Chemical Symbols and Isotopes02:31

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A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
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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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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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The newer trace elements.

W Mertz1

  • 1Nutrition Institute, U.S. Department of Agriculture, 20705, Beltsville, Maryland.

Biological Trace Element Research
|November 27, 2013
PubMed
Summary
This summary is machine-generated.

Controlled environments helped identify eight trace elements with biological roles. Rigorous contamination reduction is key for studying these essential trace elements, though human roles remain unproven.

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Environmental Health

Background:

  • The concept of a controlled environment has been pivotal in advancing trace element research.
  • Identifying essential trace elements requires minimizing metallic contamination from various sources.

Purpose of the Study:

  • To summarize the identification of eight trace elements with biological functions.
  • To outline the criteria for establishing essentiality of trace elements.
  • To discuss the current understanding of new trace elements' roles.

Main Methods:

  • Application of controlled environment techniques to minimize metallic contamination.
  • Inducing and confirming trace element deficiency in multiple animal models.
  • Observing the effects of supplementation on deficiency signs.

Main Results:

  • Eight trace elements have been identified with proven or postulated biological functions.
  • Deficiency signs confirmed across multiple animal species suggest essentiality.
  • Supplementation effectively prevents or cures deficiency symptoms.

Conclusions:

  • Controlled environments are crucial for identifying and studying essential trace elements.
  • Established criteria for essentiality are met by several newly identified trace elements.
  • Direct roles for these "new trace elements" in human health are not yet demonstrated.