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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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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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Effective Value of a Periodic Waveform01:07

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The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
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The Periodic Table and Organismal Elements00:57

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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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Properties of Transition Metals02:58

Properties of Transition Metals

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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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Pluralism versus Periodization.

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    Frans van Lunteren’s schema for historical periodization using iconic machines offers potential but faces challenges. A more effective approach highlights machine interactions rather than distinct historical eras.

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    Area of Science:

    • History of Science
    • Historiography
    • Sociology of Technology

    Background:

    • Frans van Lunteren proposed using key machines to define historical periods in scientific development.
    • This schema recognizes the epistemic, social, and material roles of machines.

    Purpose of the Study:

    • To critically evaluate Lunteren's periodization schema based on iconic machines.
    • To propose an alternative historiographical framework focusing on machine interactions.

    Main Methods:

    • Analysis of historical influence and cultural resonance of key machines.
    • Critique of periodization as a historiographical tool.

    Main Results:

    • Lunteren's periodization is problematic due to simultaneous influence and overlapping cultural resonances of machines like the balance and steam engine.
    • The proposed schema struggles to define mutually exclusive knowledge regimes.

    Conclusions:

    • A historiographical framework emphasizing complex overlaps and interactions of iconic machines is more productive.
    • The value of periodization in historical thinking, particularly for pedagogy, should be questioned.