Question

In a traid the atomic mass of the first two elements is 100 and 120?what is atomic mass of third element

Answer 1

Answer:

140

Explanation:

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Answer 2

Answer:

140

Explanation:

Because in a traid the middle term is average of 1st and 3rd atomic masses

so ,let the third one be x

we get 100+x/2=120

when  solved it gives 140

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