In a hypothetical scenario, if the mass of a neutron is doubled, the mass of a proton is halved, and — Atomic Structure Chemistry Question

💡 Solution & Explanation

The atomic mass of $^{12}_{6}\text{C}$ is primarily due to 6 protons and 6 neutrons (electron mass is negligible). Initial mass $\approx 6p + 6n = 6(1) + 6(1) = 12$ amu. New mass $\approx 6(p/2) + 6(2n) = 3 + 12 = 15$ amu. Percentage increment = $\frac{15 - 12}{12} \times 100 = 25\%$. [33, 34]