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Chapter 19: Problem 18

What is the force that holds electrons and nuclei together in an atom?

Short Answer

Expert verified
The electromagnetic force holds electrons and nuclei together in an atom.

Step by step solution

01

Understanding Atomic Structure

Atoms are made up of a nucleus, containing protons and neutrons, and a cloud of electrons that orbit the nucleus. Protons are positively charged, electrons are negatively charged, and neutrons have no charge.
02

Identifying Forces

There are various fundamental forces in nature: gravitational, electromagnetic, strong nuclear, and weak nuclear forces. Each of these forces plays a role in different interactions, but not all of them apply to electromagnetic interactions within an atom.
03

Electromagnetic Force

In an atom, the key force that acts between the electrons (negatively charged) and the nucleus (positively charged due to protons) is the electromagnetic force. This force is responsible for the attraction between opposite charges, causing the electrons to stay in the vicinity of the nucleus.

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Key Concepts

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

Electromagnetic Force
The electromagnetic force is one of the fundamental forces of nature, and it primarily deals with the interactions between charged particles. In the context of an atom, this force is crucial because it holds together the different subatomic particles that constitute the atom. The electromagnetic force arises due to the presence of electric charges.

Atoms have a positive charge in the nucleus, due to protons, and a negative charge in the surrounding electrons. The electromagnetic force attracts these oppositely charged particles.
  • This force is responsible for keeping electrons in orbit around the nucleus, balancing the attractive and repulsive interactions.
  • Without electromagnetic force, electrons would not be attracted to the positively charged nucleus.
  • It is considerably stronger than the gravitational force on the atomic scale.
Understanding how the electromagnetic force operates helps us comprehend why atoms are stable structures.
Protons and Electrons
Protons and electrons are fundamental constituents of atoms, carrying opposite electric charges. Protons reside in the nucleus of an atom while electrons orbit around it. This simple structure is foundational to atomic theory. In every atom,
  • Protons have a positive charge
  • Electrons have a negative charge
  • The number of protons equals the number of electrons in a neutral atom.
These charges result in electromagnetic interactions, which are essential for the stability of atoms. Electrons are bound to the nucleus due to the attractive forces between these opposite charges.

Furthermore, different elements have different numbers of protons, which define the elements and give rise to the diverse chemistry of the universe.
Nucleus
The nucleus is the central core of an atom, and it contains protons and neutrons. Neutrons are neutral, so they do not affect the electromagnetic forces directly, but they add to the mass and stability of the nucleus. The nucleus carries a positive charge due to the protons, and the overall charge determines how it interacts with electrons.
  • Protons give the nucleus a net positive charge.
  • The nucleus is small yet dense, making up most of the atom's mass.
  • It is held together by the strong nuclear force, which overcomes repulsion between protons.
      • The nucleus is crucial in determining an atom's identity through the number of protons, known as the atomic number. This intrinsic structure allows atoms to form bonds and create molecules, driving the diversity and complexity of matter.

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Most popular questions from this chapter

\(\rightarrow\) Describe What is the direction of the electric force between two positive charges?

Predict \& Explain An electrically neutral object is given a positive charge. (a) Does the object's mass increase, decrease, or stay the same as a result of being charged? (b) Choose the best explanation from among the following: A. To give the object a positive charge means removing some of its electrons. This will reduce its mass. B. Since electric charges have mass, giving the object a positive charge will increase its mass. C. Charge is conserved, and therefore the mass of the object will remain the same.

What is the direction of the electric force between two positive charges?

A point charge, \(q=-0.35 \mathrm{nC}\), is fixed at the origin. Where must a proton be placed in order for the electric force acting on it to be exactly opposite to its weight? (Let the \(y\) axis be vertical.)

When an object that was neutral becomes charged, does the total charge of the universe change? Explain.
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