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.When Mendeleyev published his periodic table, there were some spaces for undiscovered elements. FIgure 15-1 is a section of a similar table. A reasonable value for the atomic mass of the missing element
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.When Mendeleyev published his periodic table, there were some spaces for undiscovered elements. FIgure 15-1 is a section of a similar table. A reasonable value for the atomic mass of the missing element is__.

A. 101

B.72.3

C.68.2

D.34.8

User Hank Phung
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It's B. 72.3
(if you go to Connections Academy.)
User Skeniver
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