Question

Identify Dobereiner s triads from the following group's of elements having similar chemical properties

Answer 1

Answer:

Dobereiner triads are the elements arranged in an increasing order of atomic masses.

The mass of the middle element is equal to the mass of the mean of other two elements.

Sorry we can't identify the triads as you have not mentioned them.

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Answer 2

Answer:

Explanation:

(i) (a) Mg (24.3), (b) Ca (40.1), (c) Sr (87.6)

∴ mean of a + c

2 = 111.90

2

= 55.95

which is not approximately equal to the atomic

mass of middle element (Ca). Therefore, it does

not form Dobereiner’s triads.

(ii) (a) S (32.1), (b) Se (79.0), (c) Te (127.6)

∴ mean of a + c

2 = 159.70

2

= 79.85

which is approximately equal to atomic mass of

Se. Hence, it forms Dobereiner’s triads.

(iii) (a) Be (9.0), (b) Mg (24.3), (c) Ca (40.1)

∴ mean of a + c

2 = 49.10

2

= 24.55

which is approximately equal to atomic mass of

Mg. Hence, it forms Dobereiner’s triads.