In science, particles are the most basic unit that forms our universe. They make up matter, such as atoms, and molecules. Particles, such as gauge bosons, allow exchanges of energy between other particles. An example of a gauge boson is the photon.
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Jetzt kostenlos anmeldenIn science, particles are the most basic unit that forms our universe. They make up matter, such as atoms, and molecules. Particles, such as gauge bosons, allow exchanges of energy between other particles. An example of a gauge boson is the photon.
Particles are minuscule objects that have physical properties like mass, charge, volume, and density and can also carry energy. The most basic particles that make up matter can be divided into families, such as hadrons, leptons, and bosons. They compose all elements and their isotopes.
Particles are localized objects that can be defined on a microscopic scale, and they cover everything from molecules to subatomic particles.
Molecules are particles that are formed from chains of atoms. The constitution of molecules can vary, and they can have very complex structures. Molecules do not have an electrical charge. Examples of molecules include:
Atoms, the basic blocks of chemistry, are the smaller units of matter that can have a neutral charge. Atoms of different chemical elements have different numbers of neutrons, protons, and electrons, which gives them their distinctive properties.
Protons and neutrons are the particles that exist in the atom's nucleus. Electrons move around the nucleus.
Atoms are classified by their atomic number, which identifies the number of protons found in the nucleus. Different elements have different numbers of protons. See the following examples of atoms belonging to different elements, including their symbols and atomic numbers:
When an element has different numbers of neutrons and protons, it is called an isotope. Isotopes occur in nature but can also be produced in laboratories. Hydrogen has three natural isotopes, as listed below:
In classical atomic theory, atoms are composed of three subatomic particles: electrons, protons, and neutrons, the first two of which have an electrical charge, while neutrons are neutral. The classical theory also states that there is another particle, the photon, which has no mass and is responsible for electromagnetic waves, as in light. In summary, we have:
In the first quarter of the 20th century, only a few classical atomic particles were known, but discoveries predicted electrons with a positive charge. These predictions, made by the British scientist Paul Dirac, were confirmed by American physicist Carl Anderson after studying comics rays. The positively charged electron, also known as a 'positron', was the first proof of antimatter.
The new discoveries led to a classification of particles into large groups of families known as leptons, hadrons, and bosons.
On a subatomic scale, we now know of two other forces in addition to the gravitational and electromagnetic ones. The first of these forces acting on an atomic scale is the strong nuclear force, which is responsible for keeping particles together. The second additional force is the weak nuclear force.
Leptons, which include electrons, neutrinos, taus, and muons, are not affected by the strong force, while hadrons, which comprise protons, neutrons and mesons, are affected by it.
Bosons are responsible for three of the four fundamental forces of the universe: electromagnetism, the weak nuclear force, and the strong nuclear force. The particle responsible for gravity has not been found and exists only in theory (graviton). In the boson family, we find the photon, the gluon, the Z boson, the W boson, and the Higgs boson.
There are particles that are created as part of radioactive decay where an atom emits particles as it breaks. These particles include alpha particles and beta particles:
Particles in physics and chemistry refer to localised microscopic objects that can have physical properties like charge, mass, velocity, energy, etc.
Particles can consist of other particles, as in the case of neutrons and protons, which are made of quarks. Others, such as photons, electrons, or quarks, do not consist of other particles.
Alpha particles, which are composed of two electrons and two protons, are a source of radiation.
Particle theory predicts the energy of particles and what kinds of particles can exist.
What is a particle?
A localised object that can have physical properties.
Are atoms particles?
Yes, they are.
Which one is an isotope of hydrogen?
Protium.
What are protons made of?
Protons are made of quarks.
What is a positron?
A positively charged electron.
What is a hadron?
A particle that can interact with the strong nuclear force.
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