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, 137 amu; barium
B) atomic mass, 99 amu; technetium
C) atomic mass, 99 amu; radon
D) atomic mass 142 amu; einsteinium
Correct Answer:
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