Question

Write down three elements that show Dobereiner's triad.

Answer 1

Elements showing Dobereiner's triad

• In a group of three elements, if the atomic mass of the middle element is the average atomic mass of the other two elements, they are called Dobereiner's triad.
• For example consider three elements namely Lithium, Sodium, and Potassium.
• In this the center element is sodium and its atomic mass is 23.
• The atomic mass of first and last element is 7 and 39 respectively. When the average atomic mass of these two elements are calculated it gives

$Average atomic mass = \frac{Atomic mass of lithium + sodium}{2} = \frac{7+39}{2} = \frac{46}{2} = 23$

• Thus the average atomic mass of first and last element is 23, which is the atomic mass of element at the center, elements such as Lithium, Sodium, and Potassium are showing Dobereiner's triad.

Learn more about Dobereiner's triad

According to law of triads,Find the atomic mass of an element X

Element Weight

X = ?

Y = 80

Z = 127

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Define the Dobereiner's law of triads.write the reason for its failure.

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Answer 2

The three elements that show Dobereiner's traid lithium, sodium, potassium.