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Ch.1 - Matter, Measurement & Problem Solving
Chapter 1, Problem 133

The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0×10−13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm. What fraction of the space within the atom is occupied by the nucleus?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Structure

Atomic structure refers to the arrangement of protons, neutrons, and electrons within an atom. The nucleus, which contains protons and neutrons, is extremely small compared to the overall size of the atom, which includes the electron cloud. Understanding this structure is essential for calculating the relative sizes and volumes of the nucleus and the atom.
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Atom Structure

Volume Calculation

To determine the fraction of space occupied by the nucleus, one must calculate the volumes of both the nucleus and the atom. The volume of a sphere is given by the formula V = (4/3)πr³, where r is the radius. This calculation allows for a comparison of the volumes to find the fraction of the atom's space that the nucleus occupies.
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Constant-Volume Calorimetry

Unit Conversion

Unit conversion is crucial when comparing measurements expressed in different units. In this case, the radius of the nucleus is given in centimeters, while the radius of the hydrogen atom is in picometers (pm). Converting these measurements to the same unit is necessary to accurately compute the fraction of space occupied by the nucleus.
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