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a. |
Sorry if you picked "a" . The proton has a mass of 1.0073 amu. This is roughly the same mass as a neutron and almost two thousand times the mass of the electron. The neutron has a mass of 1.0087 amu and the electron 5.486 x 10-4 amu. A proton has a mass of 1.6726 x 10-24 g, a neutron has a mass of of 1.6749 x 10-24 and an electron has a mass of 0.00091094 x 10-24 g |
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b. |
Sorry if you picked "b". The neutron has a mass close to that for a proton. A neutron is almost 2000 times more massive than an electron. |
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c. |
Good if you picked "c". You are right. The electron is the least massive of the three particles. The electron mass is 0.00091094 x 10-24 g |