The mass number of an element can be easily approximated by adding together the number of __________ in an atom of that element.
A) protons and neutrons
B) energy levels
C) protons and electrons
D) neutrons and electrons
E) isotopes
Correct Answer:
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Q20: Which of the following best describes
Q21: Please refer to Figure 2.1 to answer
Q22: Please refer to Figure 2.1 to answer
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