list a group of elements that follows dobereiners traids
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☆Dobereiner's Law of Triads
=>Lithium, sodium, and potassium.
=>Calcium, strontium, and barium.
=>Phosphorus, arsenic, and antimony.
Sulfur, selenium, and tellurium.
=>Lithium, sodium, and potassium.
=>Calcium, strontium, and barium.
=>Phosphorus, arsenic, and antimony.
Sulfur, selenium, and tellurium.
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He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements.
Predicted vs actual atomic mass of the central atom of each triadTriad name[2]Elements and atomic masses[2][3]Element 1
MassElement 2
Mean of 1 and 3
Actual massElement 3
MassAlkali-forming elementsLithium
6.94Sodium
23.02
22.99Potassium
39.10Alkaline-earth-forming elements
[atomic masses verification needed]Calcium
40.1Strontium
88.7
87.6Barium
137.3Salt-forming elementsChlorine
35.470Bromine
80.470
78.383Iodine
126.470Acid-forming elementsSulfur
32.239Selenium
80.741
79.263Tellurium
129.243-
[atomic masses verification needed]
Predicted vs actual atomic mass of the central atom of each triadTriad name[2]Elements and atomic masses[2][3]Element 1
MassElement 2
Mean of 1 and 3
Actual massElement 3
MassAlkali-forming elementsLithium
6.94Sodium
23.02
22.99Potassium
39.10Alkaline-earth-forming elements
[atomic masses verification needed]Calcium
40.1Strontium
88.7
87.6Barium
137.3Salt-forming elementsChlorine
35.470Bromine
80.470
78.383Iodine
126.470Acid-forming elementsSulfur
32.239Selenium
80.741
79.263Tellurium
129.243-
[atomic masses verification needed]
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