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, full groups, graphic, groups 1-18, 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

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.

Triads in the periodic table

K005/7991 Rights Managed

Downloadable master

Duration: 00:00:11.12

Frame size: 1920x1080

Frame rate: 24

Audio: No

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

File size: 223.0M


Capture format: QuickTime Animation

Codec: Animation

Please contact Science Photo Library if you require the original, or other formats.


Save watermarked comp

Request un-watermarked file

Price clip Pricing

Please login to use the price calculator