Question

Identify dobereiner's triads from the following groups of elements having similar chemical properties

Answer 1

Option A is ur answer according to dobereiner's triads law which states that the atomic weight of the middle element is nearly the same as average of the atomic weights of other two elements.

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Answer 2

Answer:

1. Mg (24.3) , Ca (40.1) , Sr (87.6)

Mean = a+c /2

= 24.3+87.6 / 2

= 111.9/2

= 55.95

mean of the masses is not approximately equal to the atomic mass of middle element.

it does not form triads.

2. S (32.1) , Se (79.0) , Te (127.6)

Mean = a+c/2

= 32.1+127.6/2

= 159.7/2

= 79.85

mean of the masses is approximately equal to the atomic mass of the middle element.

it is a triad.

3. Be (9.0) , Mg (24.3) , Ca (40.1)

Mean = a+c/2

= 9.0+40.1/2

=49.1/2

= 24.55

mean of the masses is approximately equal to the mass of the middle element.

it is triad.

Hope this helps you...