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An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance…

An elements X with relative atomic mass 16.2 contains two isotopes ¹⁶₈X with relative abundance of 90% and ^m₈X with relative abundance of 10%. The value of m is

A.
16
B.
18
C.
12
D.
14

Correct Answer: Option B

Explanation

¹⁶₈X, ^m₈X
16 * (90/100) + m * (10/100) = 16.2
1440 + 10m = 1620
10m = 180
m = 18