Who arranged the elements with chemically similar properties, such as lithium,
sodium, and potassium, and showed that the properties of the middle element could
be predicted from the properties of the other two?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Johann Dobereiner.
- In 1829, Johann Dobereiner recognised triads of elements with chemically similar properties, such as lithium, sodium and potassium.
- He showed that the properties of the middle element could be predicted from the properties of the other two.
- Dobereiner is credited with improving (and giving a correct explanation of) the making of vinegar ; but he is best known for directing attention, in 1817, to the fact that the atomic weight of strontium is the mean of those of calcium and barium.