What is the mass number?

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Prepare for the IGCSE Edexcel Chemistry Test with engaging flashcards and multiple-choice questions. Each question comes with detailed hints and explanations to enhance your learning experience. Master your exam with confidence!

Multiple Choice

What is the mass number?

Explanation:
Mass number is a count of the nucleons in the nucleus—the total number of protons and neutrons. The protons define what element it is, and the neutrons add to the mass. Electrons lie outside the nucleus and have negligible mass for this purpose, so they aren’t included in the mass number. Therefore, the mass number equals protons plus neutrons, which is why the correct description is the total number of protons and neutrons in the nucleus.

Mass number is a count of the nucleons in the nucleus—the total number of protons and neutrons. The protons define what element it is, and the neutrons add to the mass. Electrons lie outside the nucleus and have negligible mass for this purpose, so they aren’t included in the mass number. Therefore, the mass number equals protons plus neutrons, which is why the correct description is the total number of protons and neutrons in the nucleus.

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