A nucleus of plutonium-239 is bombarded with a neutron causing it to produce xenon-134, zirconium-103, and 3 neutrons. how would you write the isotopic notation for zirconium-103? a) ¹⁰³ ₄₀ Zr b) ⁴⁰ ₁₀₃ Zr c) ⁶³ ₁₀₃ Zr d) ¹⁰³ ₆₃ Zr