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Chapter 5: Problem 30

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences. Compared to an atom as a whole, an atomic nucleus is (a) very tiny but has most of the mass. (b) quite large and has most of the mass. (c) very tiny and has very little mass.

Short Answer

Expert verified
(a) An atomic nucleus is very tiny but has most of the mass.

Step by step solution

01

Understanding the Structure of an Atom

An atom consists of a nucleus that contains protons and neutrons, and electrons that orbit around the nucleus. The electrons are located in electron clouds that take up a much larger volume compared to the nucleus.
02

Analyzing Mass Distribution

Most of the mass of an atom is located in the nucleus because protons and neutrons, which reside in the nucleus, are much heavier than electrons. Electrons contribute very little to the total mass of the atom.
03

Analyzing Volume Distribution

Despite containing most of the mass, the nucleus is very small in size compared to the entire atom. The electrons, while much lighter, occupy a much larger space, giving the atom its overall size.
04

Selecting the Best Answer

Considering both the size and mass distribution, the correct statement is that the nucleus is very tiny but contains most of the mass of the atom.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding the Nucleus
The nucleus is the heart of an atom. It is extraordinarily small, packed tightly at the center of the atom. Even though it's tiny in size, it holds tremendous importance. It houses two key types of subatomic particles: protons and neutrons. This compact nature gives the nucleus its incredible density. Despite the minuscule size, the nucleus accounts for most of an atom's mass. Its density and mass are what hold the atom's properties, shaping how elements behave. The encapsulation of protons and neutrons within the nucleus forms the fundamental structure for atomic chemistry.
Protons and Neutrons: The Building Blocks
Protons and neutrons play pivotal roles within the nucleus. Protons are positively charged particles that help to define the element itself. The number of protons within a nucleus, known as the atomic number, determines which element the atom belongs to. On the other hand, neutrons have no electrical charge. They act as a buffer between the protons' like charges, preventing them from repelling each other. Both protons and neutrons have considerable mass. Together, they provide almost all the physical weight of the atom. Understanding these particles helps explain why an atomic nucleus packs so much into so little space.
Mass Distribution in Atoms
Mass distribution in an atom is primarily concentrated in the nucleus. Protons and neutrons, being significantly heavier than electrons, are responsible for this. Electrons are relatively minuscule in mass, contributing very little to the total mass of an atom. Therefore, while the nucleus occupies a small portion of the atom's volume, it contains nearly all of its mass. This concentration of mass determines many of the atom's properties, such as its stability and behavior in chemical reactions. Recognizing the mass distribution provides a clear picture of atomic stability and structure.
The Electron Cloud
Surrounding the nucleus is the electron cloud. This area is where electrons exist, moving in regions that define the atom's spatial dimensions. Unlike the nucleus, the electron cloud takes up most of the atom's volume. Electrons are constantly in motion, occupying regions determined by their energy levels. Although the cloud is vast compared to the nucleus, electrons have very little mass. Thus, their large volume contributes almost nothing to the atom's total mass. The electron cloud is crucial in defining how atoms interact and bond with one another, playing a key role in chemical reactions.

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Most popular questions from this chapter

Light Around You. Roles: Scribe (takes notes on the group's activities \(),\) Proposer (proposes explanations to the group), Skeptic (points out weaknesses in proposed explanations), Moderator (leads group discussion and makes sure everyone contributes). Activity: Look carefully at all the ways in which light and matter are interacting in the room around you to answer the following questions: a. What is emitting light? b. What is absorbing light? c. What is responsible for the colors you see? d. What would the room look like if you observed it with an infrared camera? With an ultraviolet camera? With an X-ray camera? e. Are there any radio waves in the room? Explain all your answers clearly.

Elements in Space. Astronomers claim that objects throughout the universe are made of the same chemical elements that exist here on Earth. Given that most of these objects are so far away that we can never hope to visit them, why are astronomers so confident that these objects are made from the same set of chemical elements, rather than some completely different types of materials?

Be sure to show all calculations clearly and state your final answers in complete sentences. How Many Photons? Suppose that all the energy from a 100 -watt light bulb came in the form of photons with wavelength \(600 \mathrm{nm}\). (This is not quite realistic; see Problem \(57 .\) ) a. Calculate the energy of a single photon with wavelength \(600 \mathrm{nm} .\) b. How many 600 -nm photons must be emitted each second to account for all the light from this 100 -watt light bulb? c. Based on your answer to part b, explain why we don't notice the particle nature of light in our everyday lives.

Be sure to show all calculations clearly and state your final answers in complete sentences. Understanding Light Bulbs. A traditional incandescent light bulb uses a hot tungsten coil to produce a thermal radiation spectrum. The temperature of this coil is typically about \(3000 \mathrm{K}\) a. What is the wavelength of maximum intensity for this light bulb? Compare to the 500 -nm wavelength of maximum intensity for the Sun. b. Overall, do you expect the light from this bulb to be the same as, redder than, or bluer than light from the Sun? Why? Use your answer to explain why professional photographers use a different type of film for indoor photography than for outdoor photography. c. Do incandescent light bulbs emit all their energy as visible light? Use your answer to explain why these light bulbs are usually hot to touch. d. Fluorescent light bulbs primarily produce emission line spectra rather than thermal radiation spectra. Explain why, if the emission lines are in the visible part of the spectrum, a fluorescent bulb can emit more visible light than a standard bulb of the same wattage. e. Compact fluorescent light bulbs are designed to produce so many emission lines in the visible part of the spectrum that their light looks very similar to the light of incandescent bulbs. However, they are much more energy efficient: \(A\) 15-watt compact fluorescent bulb typically emits as much visible light as a traditional incandescent 75 -watt bulb. Although compact fluorescent bulbs generally cost more than incandescent bulbs, is it possible that they could save you money? Besides initial cost and energy efficiency, what other factors must be considered?

Define atomic number and atomic mass number. Under what conditions are two atoms different isotopes of the same element? What is a molecule?
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