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(A) The mass of an atom is primarily concentrated in its nucleus because protons and neutrons (nucleons) are much heavier than electrons. The mass of

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$99.9$

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(A) The mass of an atom is primarily concentrated in its nucleus because protons and neutrons (nucleons) are much heavier than electrons. The mass of a proton is approximately $1.67 	imes 10^{-27} 	ext{ kg}$, while the mass of an electron is approximately $9.11 	imes 10^{-31} 	ext{ kg}$. Since the mass of a proton is about $1836$ times the mass of an electron, the electrons contribute very little to the total mass of the atom. Therefore, more than $99.9\%$ of the total mass of an atom is concentrated in its nucleus.

What is the approximate percentage of the total mass of an atom that is concentrated in its nucleus (in $\%$)?

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