If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of this element?
A. atomic mass, 99 amu; radon
B. atomic mass, 99 amu; technetium
C. atomic mass, 137 amu; barium
D. atomic mass 142 amu; einsteinium
Answer: B
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