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In atomic structure, how do you determine the mass number (A) of an element’s atom?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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In a simplified model of subatomic particles, what is the relative mass of an electron compared with a proton (proton mass )?
A
Approximately
B
Approximately
C
Approximately
D
Approximately
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Understand that the problem asks for the relative mass of an electron compared to a proton, where the proton's mass is taken as 1 unit.
Recall that the proton is much heavier than the electron, so the electron's mass will be a fraction of the proton's mass.
Use the known approximate mass ratio: the proton's mass is about 1836 times the mass of the electron.
Express the electron's mass relative to the proton as a fraction: electron mass = \(\frac{1}{1836}\) \(\times\) proton mass.
Therefore, the relative mass of the electron compared to the proton is approximately \$\(\frac{1}{1836}\)\$ when the proton mass is set to 1.
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