Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 3 - No. 13)
What is the formula to calculate the number of neutrons in an atom?
Number of neutrons = atomic number + proton number
Number of neutrons = mass number - proton number
Number of neutrons = atomic number - mass number
Number of neutrons = mass number + proton number
Explanation
The number of neutrons is determined by subtracting the atomic number (number of protons) from the mass number (protons + neutrons).
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