What is the mass number of an atom with 6 protons and 6 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 6 protons and 6 neutrons?

Explanation:
Mass number is the total number of protons and neutrons in the nucleus. It is found by adding the number of protons (Z) and neutrons (N): A = Z + N. Here there are 6 protons and 6 neutrons, so A = 6 + 6 = 12. Electrons don’t affect the mass number, they only balance charge. So the correct mass number is 12, which corresponds to carbon-12.

Mass number is the total number of protons and neutrons in the nucleus. It is found by adding the number of protons (Z) and neutrons (N): A = Z + N. Here there are 6 protons and 6 neutrons, so A = 6 + 6 = 12. Electrons don’t affect the mass number, they only balance charge. So the correct mass number is 12, which corresponds to carbon-12.

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