IGCSE Chemistry

Chapter 2: Atomic Structure

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Question

An atom of sodium is represented as ²³₁₁Na. State its number of protons, neutrons, and electrons.

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Answer

Protons = 11 (atomic number)
Electrons = 11 (equal to protons in neutral atom)
Neutrons = 12 (mass number − atomic number: 23 − 11 = 12)

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