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Q.

Identify the Dobereniers traid amond the following. 

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a

Ne, Ca, Na 

b

Cl, Na, Ca 

c

H,N,O 

d

Li, Na, K 

answer is C.

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Detailed Solution

According to Dobereiner's law of triads, the atomic mass of the middle element of a triad is equal to the arithmetic mean of the atomic masses of the other two elements. In the triad of lithium, sodium and potassium. The atomic mass of lithium = 7 and the atomic mass of potassium = 39. The arithmetic mean of atomic masses of lithium and potassium gives atomic mass of sodium=23. 

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