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Chapter 2: Problem 16

What are the three subatomic particles in atoms?

Short Answer

Expert verified
The three subatomic particles in atoms are protons, neutrons, and electrons.

Step by step solution

01

Understand the Structure of an Atom

Atoms are the basic units of matter and consist of a nucleus surrounded by a cloud of electrons. The nucleus contains protons and neutrons.
02

Identify Subatomic Particles

The three main subatomic particles found in atoms are protons, neutrons, and electrons.
03

Define Each Subatomic Particle

Protons are positively charged particles found in the nucleus. Neutrons have no charge (they are neutral) and are also found in the nucleus. Electrons are negatively charged particles and orbit the nucleus in the electron cloud.

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Key Concepts

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

Protons
Protons are one of the essential subatomic particles that form the nucleus, the core part of an atom. They carry a positive electrical charge. This charge is exactly equal in magnitude, but opposite, to the charge of an electron.
As such, they play a crucial role in holding the atom together and determining its identity:
  • Each proton has a mass of about 1 atomic mass unit (amu), making it a significant contributor to the atom's total mass.
  • Protons are composed of smaller particles known as quarks, which are bound together by the strong nuclear force.
The number of protons in an atom's nucleus is called the atomic number. This defines the element on the periodic table.
For instance, all atoms of hydrogen have one proton, while all carbon atoms have six. This means the properties of an element are determined by the number of protons in its nucleus.
Neutrons
Neutrons share the atomic nucleus with protons and are incredibly important for the stability of the nucleus. Despite having no electrical charge, neutrons help in binding the nucleus together through the strong nuclear force, which operates over very short distances:
  • Neutron mass is slightly greater than that of a proton, roughly 1 amu, and they too consist of quarks.
  • The presence of neutrons in the nucleus often acts as a buffer between protons, reducing repulsion between them due to their like charges.
Isotopes of elements exist when atoms have the same number of protons but different numbers of neutrons. These isotopes can have different properties, such as differing in stability or radioactivity.
For example, Carbon-12 and Carbon-14 are isotopes of carbon with differing amounts of neutrons.
Electrons
Electrons are negatively charged particles that orbit the nucleus in a cloud-like formation, creating what we call the electron cloud. They are crucial for the chemical behavior of atoms:
  • Electrons are much lighter than protons and neutrons, having a mass of approximately 1/1836 that of a proton. As a result, they contribute very little to the total mass of the atom.
  • They occupy energy levels or shells around the nucleus, where each shell can contain a specific number of electrons.
The location and number of electrons influence how atoms interact with one another, forming chemical bonds:
  • The sharing or transfer of electrons between atoms leads to the formation of compounds.
  • An atom with a different number of electrons than protons will have a charge, becoming an ion.
Electrons are integral to both electricity and magnetism, making them vital to numerous everyday technologies.

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Most popular questions from this chapter

Which of the following chemical equations illustrates a typical decomposition reaction? (a) \(\mathrm{A}+\mathrm{B} \longrightarrow \mathrm{AB}\) (b) \(\mathrm{AB}+\mathrm{CD} \longrightarrow \mathrm{AD}+\mathrm{CB}\) (c) \(2 \mathrm{~A}_{2}+\mathrm{B}_{2} \longrightarrow 2 \mathrm{~A}_{2} \mathrm{~B}\) (d) \(\mathrm{AB} \longrightarrow \mathrm{A}+\mathrm{B}\)

Isotopes of an element differ from each other in the number of (a) protons in the nucleus, (b) neutrons in the nucleus, (c) electrons in the outer shells, (d) \(a, b\), and care all correct.

What is a salt? How does a salt differ from an acid or a base?

In an exergonic reaction, (a) large molecules are broken down into smaller ones, (b) small molecules are assembled into larger ones, (c) molecules are rearranged to form new molecules, (d) molecules move from reactants to products and back, (e) energy is released during the reaction.

What is the following type of decomposition reaction called? $$ \mathrm{A}-\mathrm{B}-\mathrm{C}-\mathrm{D}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{A}-\mathrm{B}-\mathrm{C}-\mathrm{H}+\mathrm{HO}-\mathrm{D} $$
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