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Can the following groups of elements be ...

Can the following groups of elements be classified as Dobereiner's triad ?
(a) `Na, Si, Cl`
(b) `Be, Mg, Ca`
Atomic mass of `Be` 9, `Na` 23, `Mg` 24, `Si` 28, `Cl` 35, `Ca` 40
Explain by giving reason.

Text Solution

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(a) No, these elements cannot be classified as triads because these do not have same properties. However, the atomic mass of `Si` (28) is almost the mean of the atomic masses of elements `Na` (23) and `Cl` (35) i.e., `23 + 35 = 58//2 = 29`.
Note : The Dobereiner's triad is meaningful only if the elements present in the triad have almost identical properties.
(b) Yes, these elements can be classified as triads. These belong to the same group (2) and have almost identical properties. The atomic mass of `Mg` (24) is almost the mean of the atomic masses of the elements `Be` (9) and `Ca` (40) i.e., `9 + 40 = 49//2 = 24.5`
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