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If the sum of atomic mass of 3 elements ...

If the sum of atomic mass of 3 elements forming Dobereiner traid is 69, then atomic mass of second element

A

7

B

46

C

39

D

23

Text Solution

Verified by Experts

The correct Answer is:
D
`{:(Li,,Na,,K),(7,+,23,+,39=69):}`
`(7+39)/(2)=23`
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