Question

similarities between dobereineer traid, newland and mandeelev's periodic table​

Answer 1

Answer:

periodic property were based on atomic mass

Explanation:

all of them arranged the elements in increasing order of atomic mass......

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Answer 2

Answer:

Dobereiner’s triads and Newland’s law of octaves were early attempts at classifying elements into groups based on their properties. Since many new elements were discovered over the course of the 18th and 19th centuries, the broad classification of elements into metals and non-metals became inefficient. Several experiments were conducted in order to identify elements with similar properties and group them together.

It is important to note that the primitive methods of classifying elements, such as Newland’s law of octaves and Dobereiner’s triads, laid the foundation for the development of the modern periodic table.

What are Dobereiner’s Triads?

Dobereiner’s triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties.

Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad. He also suggested that this law could be extended for other quantifiable properties of elements, such as density.

Newland’s Law of Octaves

In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He arranged them in an ascending order based on their atomic masses and observed that every 8th element had similar properties. On the basis of this observation, Newland’s law of octaves was formulated.

The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses. An illustration detailing the elements holding similar properties as per Newland’s law of octaves is provided below.

Newland's Law of Octaves

Newlands compared the similarity between the elements to the octaves of music, where every eighth note is comparable to the first. This was the first attempt at assigning an atomic number to each element. However, this method of classifying elements was met with a lot of resistance in the scientific community.

Explanation:

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