If the mystery element Unknownium has 4 isotopes, Un-504, Un-501, Un-503, and Un-506. The relative abundance of Un-504 is 25%, Un-501 is 15%, Un-503 is 20% and Un-506 is 40%. Calculate the average atomic mass. a
505.2
b
503.7
c
504.15
d
506.01

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