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10 problems. P1: 'Oxygen: Z=8. Number of protons = ___' (8). P2: 'Number of electrons in neutral oxygen = ___' (8). P3: 'Oxygen-16: mass number = 16. Neutrons = ___' (8). P4: 'Carbon-14 has ___ protons and ___ neutrons' (6, 8). P5: 'An atom with 11 protons, 12 neutrons: element = ___, mass number =
17
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