Credit: RHYS LEWIS, AHS, DECD, UNISA/ANIMATE4.COM/SCIENCE PHOTO LIBRARY

Caption: Triads in the periodic table. Animation showing examples of triads, sets of three elements within a group in the periodic table. The historic definition of a triad, as discovered from 1829 by German chemist Johann Wolfgang Dobereiner (1780-1849), was that for a particular property the middle element of the three would have a value that was the average of the other two elements. This early discovery of trends in chemical properties laid the groundwork for the development of the modern periodic table. The five triads shown in this animation are atomic weight triads: Li-Na-K (lithium, sodium, potassium); Ca-Sr-Ba (calcium, strontium, barium); P-As-Sb (phosphorus, arsenic, antimony); S-Se-Te (sulphur, selenium, tellurium); and Cl-Br-I (chlorine, bromine, iodine).

Release details: Model release not required. Property release not required.

Keywords: animated, animation, antimony, arsenic, atomic weight, averages, barium, bromine, ca-sr-ba, calcium, chemical, chemical properties, chemistry, chlorine, cl-br-i, dobereiner, dobereiner triad, dobereiner triads, early trends, education, educational, element, elements, graphic, groups 1-8, history of the periodic table, illustration, iodine, johann dobereiner, johann wolfgang dobereiner, li-na-k, lithium, no-one, nobody, p-as-sb, periodic table, periodicity, periods 1-7, phosphorus, potassium, s-se-te, school science, selenium, sodium, strontium, sulphur, tellurium, triad, triads, white background

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Triads in the periodic table

K005/7998 Rights Managed

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Duration: 00:00:27.02

Frame size: 1920x1080

Frame rate: 24

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 498.5M

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Capture format: QuickTime Animation

Codec: Animation

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