Isotones are nuclides (atoms of different elements) that have the same number of neutrons but different numbers of protons (and thus different atomic numbers). For ₁H³, Atomic number (Z) = 1, Mass number (A) = 3. Number of neutrons (N) = A - Z = 3 - 1 = 2. For ₂He⁴, Atomic number (Z) = 2, Mass number (A) = 4. Number of neutrons (N) = A - Z = 4 - 2 = 2. Both have 2 neutrons.
₁H³ and ₂He⁴ are
Asked in PPSC CS Prelims 2015 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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