Ca, Sr and Ba are the elements in a Dobereiner traid. Atomic weight of Ca, Sr are 40gm and
87.5gm respectively. What is the atomic weight of Ba.
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Acc. to doberenier trait the atons are in the increasing order of the atomic mass and the mass of middle atom is the rogh average of the other two atoms
so Ca + Ba/ 2 = Sr
40 + Ba = 87.5*2
40 + Ba = 175
Ba = 175 -40
Ba = 135
The atomic weight of Ba is 135
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