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The elements $A, B$ and $C$ form a Dobereiner's Triad. If the sum of atomic masses of $A, B$ and $C$ is $150,$ then the atomic mass of $B$ is [The order of atomic masses is $A < B < C$ ]

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$30$

$40$

$90$

$50$

answer is C.

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Detailed Solution

$B = \frac{A+C}{2} A + B + C = 150 A + C = 2 B; 2 B + B = 150$

$3 B = 150 B = 50$

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