Assertion:In triads, three elements have same gap between their atomic masses.
Reason: The chemical and physical properties of elements in a triads are similar.
A
Both Assertion and Reason are true and reason is the correct explanation of Assertion.
B
Assertion is true but Reason is false
C
Assertion is false but Reason is true
D
Both assertion and reason are false.
E
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Answers
Answer: Option C
Assertion is false. In a triad,the mass of the middle element is approximately the average of the masses of the other two elements when arranged in increasing or decreasing atomic masses.
Reason is true
The correct option is E) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Explanation:
Johann Wolfgang Dobereiner, a German scientist, discovered groups of elements having related properties and named them Dobereiner's triads. He noticed that groupings of three elements, known as triads, could develop where each element had a similar set of physical and chemical characteristics.
The arithmetic mean of the atomic masses of the first and third elements in a triad would be about equal to the atomic mass of the second element in that triad, according to Dobereiner's law of triads. Additionally, he proposed that this law be expanded to include additional elements' quantitative attributes, such as density.
The following is a list of Dobereiner's method of identifying elements' main drawbacks.
- This model is no longer valid due to the discovery of new components.
- Newly found substances did not correspond to the triads.
- There were just 5 Dobereiner's triads found in all.
- None of the triads could fit even a few well-known elements.
Due to these drawbacks, different systems for categorising items were created.
To know more about Dobereiner's Triads, click on the links below:
https://brainly.in/question/16133830
https://brainly.in/question/1117690
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