Answer:
949
Step-by-step explanation:
Answer: a. 11 protons, 12 neutrons, 11 electrons
B. 20 protons, 20 neutrons, 20 electrons
C. 29 protons, 35 neutrons, 29 electrons
D. 47 protons, 61 neutrons, 47 electrons
Explanation: mass number- atomic number = neutrons. Protons = electrons
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