Beatrice Lang
Atoms are the building blocks of the universe, and everything in the universe is made of atoms. These atoms contain electrically charged particles called electrons, which are attracted to protons. Electrons and protons carry equal but opposite electrical charges, with electrons carrying a negative charge and protons carrying a positive charge. The movement of electrons creates electricity, and electrons transmit an electrical charge through solid matter, such as metal, to produce an electrical current. This movement of electrons can be caused by applying a force, such as rubbing two objects together, which can make electrons shift from one atom to another. This results in static electricity, where atoms have a positive or negative charge. Electricity can also be produced by chemical reactions, such as in batteries, or by using moving magnetic fields to push and pull electrons.
| Characteristics | Values |
|---|---|
| Electric charge | A physical property of matter that causes it to experience a force when placed in an electromagnetic field |
| Carriers of electric charge | Protons and electrons |
| Positive charge | Carried by protons |
| Negative charge | Carried by electrons |
| Neutral charge | Equal number of protons and electrons |
| SI unit of electric charge | Coulomb (C) |
| Electric field | Produced by electric charges |
| Magnetic field | Produced by moving charges |
| Electrons | Elementary particles with no known components or substructure |
| Protons | Located in the nucleus of an atom |
| Neutrons | No charge |
| Electron mass | 9.109 x 10^-31 kg |
| Electron spin | Half-integer (1/2) value |
| Electron behaviour | Exhibits properties of both particles and waves |
| Electron interaction | Electrons can collide with other particles |
| Electricity generation | Conversion of kinetic energy into electrical energy |
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What You'll Learn
Electric charge
The electric charge of a macroscopic object is the sum of the electric charges of the particles that it is made up of. This charge is often small because atoms typically have equal numbers of protons and electrons, resulting in a net charge of zero and making the atom neutral. An ion, on the other hand, is an atom or group of atoms that has gained or lost one or more electrons, resulting in a net positive or negative charge.
The SI unit of electric charge is the coulomb (C), defined as the quantity of charge that passes through the cross-section of an electrical conductor carrying one ampere for one second. The lowercase symbol "q" is often used to denote a quantity of electric charge. The quantity of electric charge can be directly measured with an electrometer or indirectly with a ballistic galvanometer.
The distinction between positive and negative charges is crucial for understanding the behaviour of electrically charged objects. Like charges repel each other, while unlike charges attract. This principle is fundamental to various concepts in electromagnetism and is essential for comprehending the interaction of charged particles.
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Protons and neutrons
Protons and electrons carry an electrical charge. Protons have a positive charge, while electrons have a negative one. Opposite charges attract each other, and an atom is in balance when it has an equal number of protons and electrons. Neutrons, on the other hand, carry no charge. The number of neutrons in an atom can vary, while the number of protons determines what type of atom, or element, it is. For example, hydrogen atoms have one proton, while carbon atoms have six.
The electrons in the shells closest to the nucleus are strongly attracted to the protons. However, electrons in the outermost shells may not have a strong attraction to the protons and can be pushed out of their orbits with the application of force. These electrons can then shift from one atom to another. This movement of electrons is what we call electricity.
Therefore, while protons and neutrons are integral parts of atoms, only protons and electrons carry an electrical charge. Neutrons, being electrically neutral, do not interact with electricity in the same way.
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Electrons and their shells
Electrons are subatomic particles that carry a negative charge. They spin around the nucleus of an atom in shells. The nucleus is at the centre of an atom and is made up of particles called protons and neutrons. Protons carry a positive charge. Electrons are attracted to protons due to their opposite charges. They are held in their shells by an electrical force.
Electrons follow specific paths, or shells, around the nucleus. These shells are also known as orbitals. Each shell is located at a certain distance from the nucleus and can contain only a fixed number of electrons. The first shell, also known as the K shell, can hold up to two electrons. The second shell, or L shell, can hold up to eight electrons. The third shell can contain up to 18 electrons, and so on, with the general formula of the nth shell being able to hold up to 2n^2 electrons. The maximum number of electrons in one shell, among known elements, is 32.
The number of electrons in an atom's outermost shells influences how atoms of that element interact with atoms of other elements. This is related to the fact that elements in the same group on the periodic table tend to have the same number of electrons in their outer shell. These outer electrons are also called valence electrons. For example, the halogens (fluorine, chlorine, bromine, and iodine) in Group 17 all need one additional electron to achieve a full valence shell. When sodium (a Group 1 alkali metal with one valence electron) reacts with chlorine, they form the highly stable compound sodium chloride (NaCl), commonly known as salt. Both elements achieve complete outer shells through this combination.
The concept of electron shells was first proposed by Niels Bohr in 1913. He suggested that the capacity of the inner orbit of an atom increases to eight electrons as the atom gets larger. Bohr's model was later corrected by chemists such as Irving Langmuir, Charles Bury, J.J. Thomson, and Gilbert Lewis, who introduced the maximum number of electrons in each shell, such as two in the first shell and eight in the second. Bohr published his electron shell atomic theory in 1922, and it continues to be a subject of study and fascination for scientists.
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Electric and magnetic fields
An electromagnetic field (EM field) is a physical field that represents the electric and magnetic influences generated by, and acting upon, electric charges. The field can be regarded as a combination of an electric field and a magnetic field. Electric charge is a physical property of matter that causes it to experience a force when placed in an electromagnetic field. Electric charge can be positive or negative, and like charges repel each other while unlike charges attract. The SI unit of electric charge is the coulomb (C).
A stationary charge with respect to an observer produces an electric field. When the charge moves, it creates an electric current, which produces a magnetic field as well as an electric field. The interaction of electric charges with an electromagnetic field is the source of the electromagnetic or Lorentz force, which is one of the four fundamental interactions in physics. The Lorentz force law states that a charge subject to an electric field feels a force along the direction of the field, and a charge moving through a magnetic field feels a force that is perpendicular to both the magnetic field and its direction of motion.
The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law. Maxwell's equations detail how the electric field converges towards or diverges away from electric charges, how the magnetic field curls around electrical currents, and how changes in the electric and magnetic fields influence each other.
In practical applications, the relationship between electric and magnetic fields is used in devices such as electric motors and generators.
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Electrostatic attraction and repulsion
The fundamental property of matter that exhibits electrostatic attraction or repulsion in the presence of other charged matter is called electric charge. It can be positive, negative, or neutral. Protons carry a positive charge, while electrons carry a negative charge. Atoms typically have equal numbers of protons and electrons, resulting in a net charge of zero and making the atom neutral.
Electrostatic forces cause like charges to repel each other and unlike charges to attract. For example, two negative charges will repel each other, while a positive charge will attract a negative charge. The force of attraction or repulsion is directly proportional to the value of each charge and inversely proportional to the square of the distance between them. This means that as the distance between charges increases, the force of attraction or repulsion decreases, and vice versa.
Coulomb's law, formulated by French physicist Charles-Augustin de Coulomb in 1785, mathematically describes the electric force between charged objects. It states that the magnitude of the attractive or repulsive electrostatic force between two point charges is directly proportional to the product of the magnitudes of their charges and inversely proportional to the square of the distance between them. Coulomb's experiments with a torsion balance provided empirical evidence for this relationship.
The study of photon-mediated interactions among charged particles is called quantum electrodynamics. Electric charges produce electric fields, and when they are in motion, they also generate magnetic fields. The interaction of electric charges with an electromagnetic field, a combination of electric and magnetic fields, results in the electromagnetic force, one of the four fundamental forces in physics.
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Frequently asked questions
Electricity is a form of energy resulting from the existence of charged particles like electrons or protons. It can be accumulated statically or flow dynamically as a current.
Electrons are negatively charged subatomic particles that orbit the nucleus of an atom. They are involved in various applications, including electronics, batteries, and solar panels.
Electrons carry an electric charge, and their movement creates electricity. When electrons move from one atom to another, electricity is generated.
When electrons shift between atoms, they create a charge imbalance, resulting in either a positive or negative charge. This movement of electrons is what we call electricity.
Magnets have a unique molecular structure, with electrons spinning in the same direction, creating a magnetic force. Moving magnetic fields can push and pull electrons, and certain metals like copper and aluminium have electrons that are easily influenced.
