If the mass of an electron is halved, the mass of a proton is doubled, and the mass of a neutron is — Atomic Structure Chemistry Question
Question
If the mass of an electron is halved, the mass of a proton is doubled, and the mass of a neutron is three-fourths of its original value, find the percentage change in the atomic weight of an $^{16}O$ atom.
Answer: C
💡 Solution & Explanation
Original mass $\approx 8p + 8n = 16 \text{ amu}$. New mass $\approx 8(2p) + 8(0.75n) = 16 + 6 = 22 \text{ amu}$ (electron mass is negligible). Increase = $(22 - 16)/16 = 6/16 = 37.5\%$.
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