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What contribution did Dobereiner make to the systematic arrangement of the elements? - Leaving Cert Chemistry - Question d - 2005
Question d
What contribution did Dobereiner make to the systematic arrangement of the elements?
Worked Solution & Example Answer:What contribution did Dobereiner make to the systematic arrangement of the elements? - Leaving Cert Chemistry - Question d - 2005
Step 1
He grouped elements of similar properties
Answer
Dobereiner proposed a systematic method for categorizing elements based on their chemical properties. This method involved grouping elements that exhibited similar properties together, which was a significant step towards the modern periodic table.
Step 2
in groups of three / triads / description of triad
Answer
He specifically arranged these groups into sets of three, known as triads. In these triads, he observed that the properties of the middle element would often be an average of the other two elements, both in terms of atomic weights and other chemical properties. This helped in establishing a more organized structure in understanding the relationship between different elements.