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Chapter 5: Problem 32

Compared to an atom as a whole, an atomic nucleus (a) is very tiny but has most of the mass. (b) is quite large and has most of the mass. (c) is very tiny and has very little mass.

Short Answer

Expert verified
Option (a): The nucleus is very tiny but has most of the mass.

Step by step solution

01

Analyze the Structure of an Atom

An atom is composed of electrons, protons, and neutrons. Electrons orbit around the nucleus, while protons and neutrons reside in the nucleus.
02

Consider the Size of the Nucleus

The nucleus of an atom is extremely small compared to the overall size of the atom. It occupies only a tiny fraction of the atom's volume.
03

Evaluate the Mass Distribution

Although the nucleus is small, it contains protons and neutrons, which are much heavier than electrons. Thus, nearly all of an atom's mass is concentrated in the nucleus.
04

Choose the Correct Option

Given the small size yet large mass concentration in the nucleus, the correct option is (a): the nucleus is very tiny but has most of the mass.

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Key Concepts

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

Atom Structure
Atoms are the building blocks of matter, and understanding their structure is key to grasping the concept of the atomic nucleus. An atom is composed of three main subatomic particles:
  • Protons, which carry a positive charge
  • Neutrons, which have no charge
  • Electrons, which carry a negative charge
Protons and neutrons reside in the center part of the atom, known as the nucleus. Electrons orbit around the nucleus in specific regions called electron shells or electron clouds. This entire arrangement defines the structure of an atom.
Mass Distribution in Atoms
The mass distribution within an atom is skewed towards the nucleus. This results from the fact that both protons and neutrons, the two heavier subatomic particles, are housed in the nucleus. Electrons, by contrast, have a much smaller mass and primarily exist in the atom's electron cloud. In essence, even though the nucleus is tiny compared to the entire atom, it contains almost all of the atom's mass. This makes the atomic nucleus the dense core where most of the atom鈥檚 weight is concentrated.
Protons and Neutrons
Protons and neutrons are termed nucleons since they both reside inside the nucleus of the atom.
  • Protons: With a positive charge, they define the chemical identity of an element. The number of protons in the nucleus is also called the atomic number.
  • Neutrons: These are neutral particles with no charge, adding mass to the nucleus without altering its charge. Their number can vary within atoms of the same element, giving rise to isotopes.
Together, protons and neutrons make the nucleus extremely dense, with each particle contributing approximately the same mass.
Size of Nucleus
Despite its significance in terms of mass, the atomic nucleus occupies only a minuscule part of the atom's entire volume. The nucleus is incredibly small, often compared to a tiny marble in a vast stadium when visualizing the atom's size. It represents only about 1/10,000th of the atom's volume. This disproportionate size-to-mass ratio is what makes the nucleus unique and central in studies involving atomic particles. Its massive density in a concentrated space underlines many physical properties of matter.

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Most popular questions from this chapter

Your Microwave Oven. A microwave oven emits microwaves that have just the right wavelength needed to cause energy level changes in water molecules. Use this fact to explain how a microwave oven cooks your food. Why doesn't a microwave oven make a plastic dish get hot? Why do some clay dishes get hot in the microwave? Why do dishes that aren't themselves heated by the microwave oven sometimes still get hot when you heat food on them? (Note: It's not a good idea to put dishes without food in a microwave.

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