Estimate the percentage of the total mass of a atom that is due to (a) electrons, (b) protons, and (c) neutrons by assuming that the mass of the atom is simply the sum of the masses of the appropriate numbers of subatomic particles. The mass of an electron is 0.00054858 amu, the mass of a proton is 1.0073 amu, and the mass of a neutron is 1.0087 amu.

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Asked Jan 27, 2019
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Estimate the percentage of the total mass of a atom that is due to (a) electrons, (b) protons, and (c) neutrons by assuming that the mass of the atom is simply the sum of the masses of the appropriate numbers of subatomic particles. The mass of an electron is 0.00054858 amu, the mass of a proton is 1.0073 amu, and the mass of a neutron is 1.0087 amu.

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Expert Answer

Step 1

Dear student, you have not mentioned the atom for which the mentioned percentage is required. I am doing the problem for a C-12 atom. The precedure is same for any atom only the number of particles and the subsequent calculations would vary.

So, the atomic number of C is 6

Number of protons in a C-12 atom = 6

Number of electrons is same as the number of protons in a neutral atom. So, the number of electrons in a C-12 atom = 6

Mass number of C-12 atom is 12.

Since, mass number = number of protons+ number of neutrons

Thus, number of neutrons in a C-12 atom is 6.

Step 2

Given that the mass of an electron is 0.00054858 amu.

So, mass of 6 electrons is:

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Step 3

Given that the mass of a proton is 1.0073 a...

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