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Question

# What percent of the total mass of one atom of each of the following elements comes from protons?(a) selenium (mass of one atom $=1.311 \times 10^{-22} \mathrm{~g}$ ) (b) xenon (mass of one atom $=2.180 \times 10^{-22} \mathrm{~g}$ ) (c) chlorine (mass of one atom $=5.887 \times 10^{-23} \mathrm{~g}$ ) (d) barium (mass of one atom $=2.280 \times 10^{-22} \mathrm{~g}$ )

Solution

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In this problem, we are asked to determine the percent of the total mass of atom that comes from electrons.

To answer this we can simply divide the mass of the protons in each element, then divide it by the mass of one atom of that element, and multiplied it by 100 to get the percentage.

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