The three elements A,B and C with simlar
properties have atomic masses X,Y and
Z. respectively. The
mass of Y is approximatelty equal to
the average mass of x and z. what is
such an arrangement of elements called
as? Give one
example of such a set of
elements.
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Answer:
Such arrangements of elements are given by DOBERINER (1817)... He gave a rule known as Triad rule...
Explanation:
Example: ➡ Li, Na and K...
Mass of Lithium- 7 (X)
Mass of Sodium- 23 (Y)
Mass of Potassium- 39 (Z)
➡Y = (X + Z)/2
➡ Y = (7 + 39) /2
➡ Y = 46/2
➡ Y = 23
Hence, rule satified here... But not applicable to every element of a group....
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