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Science Question Explained 🧬 To calculate the number of neutrons in an isotope, you'll need to know the atomic number (Z) and the mass number (A) of the isotope. Here's a simple formula: Number of Neutrons (N) = Mass Number (A) - Atomic Number (Z) 1. Find the atomic number (Z) on the periodic table. It's usually a whole number and represents the number of protons in the nucleus. 2. Locate the mass number (A) of the isotope. The mass number is usually written as a superscript before or above the
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