Question

Using Dobereiner’s law of triads, find the missing number.
, ,
Ki/7,na/--,k/39

Answer 1

Answer:

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explanation: HERE THE ANS IS Na, =23..

Becozz..the average atomic mass of the 1st and last element =7+39/2 =23

therefore, doereiner's law of triads is true for it.......

i hope u get it....byee