What is the mass number of an atom with 3 protons and 4 neutrons?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

What is the mass number of an atom with 3 protons and 4 neutrons?

Explanation:
Mass number is the total number of nucleons in the nucleus, which means protons plus neutrons. With 3 protons and 4 neutrons, you add them to get 3 + 4 = 7. So the mass number is 7. The other numbers would only represent the count of protons (3) or neutrons (4), not their sum, so they don’t describe the mass number.

Mass number is the total number of nucleons in the nucleus, which means protons plus neutrons. With 3 protons and 4 neutrons, you add them to get 3 + 4 = 7. So the mass number is 7. The other numbers would only represent the count of protons (3) or neutrons (4), not their sum, so they don’t describe the mass number.

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