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Atom,moleculas and particles.
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- 1An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.What is an atom?
An atom a fundamental piece of matter. (Matter is anything that can be touched physically.) Everything in the universe (except energy) is made of matter, and, so, everything in the universe is made of atoms.
An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud. The electrons carry a negative charge and the protons carry a positive charge. In a normal (neutral) atom the number of protons and the number of electrons are equal. Often, but not always, the number of neutrons is the same, too. - 2Particles That Are Smaller Than an Atom. ... In actuality, it is these subatomic particles that form the building blocks of our world, such as protons, neutrons, electrons and quarks, or destroy it, such as alpha and beta particles.Particles That Are Smaller Than an Atom
By Doug Bennett; Updated April 25, 2017
Atoms represent the smallest pieces of matter with constant properties, and are referred to as the basic unit of matter. However, scientists have discovered that atoms are not the smallest particles in nature. Despite their minuscule size, a number of much smaller particles exist, known as subatomic particles. In actuality, it is these subatomic particles that form the building blocks of our world, such as protons, neutrons, electrons and quarks, or destroy it, such as alpha and beta particles. - 3Protons The proton was discovered by Earnest Rutherford in 1919. This subatomic particle is located in the nuclei of atoms. The particle’s mass is equal to approximately one atomic mass and, along with the atom’s neutrons, accounts for the majority of an atom’s overall mass. Protons have a positive charge. The atoms of every element have a set number of protons, representing the elements atomic number.Neutrons
The neutron was discovered by James Chadwick in 1932. This subatomic particle is located in the nuclei of atoms. The particle’s mass is equal to approximately one atomic mass and, along with the atom’s protons, accounts for the majority of the atom’s overall mass. Neutrons have no electrical charge. The number of neutrons can vary for atoms of a given element, with each variation called an isotope. - 4Electrons The electron was the first subatomic particle to be identified, discovered by Sir John Joseph Thomson in 1897. Electrons orbit around an atom’s nucleus in what is referred to as an electron cloud. The particle’s mass is tiny, approximately 1,840 times smaller than protons and neutrons. The subatomic particle has a negative charge. Electrons are primarily responsible for chemical interactions. Electrons in the outer orbit are lost, gained or shared with other atoms, forming chemical bonds.Alpha Particles
Alpha particles represent the nuclei of helium atoms, comprised of two protons and two neutrons. These subatomic particles are produced by radioactive alpha decay in large, unstable atoms. These particles have relatively low energy and are unable to penetrate very deeply into other materials. However, due to their size, alpha particles can be extremely destructive to human cells that they manage to come into contact with. - 5Beta Particles Beta particles represent free electrons or positrons. Positrons have the same mass as electrons, but posses a positive charge. Beta particles are produced by radioactive beta decay. They have relatively high energy and move at high speeds. Because of these properties, beta particles are able to penetrate materials around 100 times deeper than alpha particles.Quarks
Quarks represent the smallest known subatomic particles. These building blocks of matter are considered the new elementary particles, replacing protons, neutrons and electrons as the fundamental particles of the universe. There are six types, called flavors of quarks: up, down, charm, strange, top and bottom. Furthermore, quarks come in three colors, representing their force: red, blue and green. Up and down quarks are the most common and least massive. Protons are comprised of one down and two up quarks, while neutrons are comprised of one down and two up quarks.
https://sciencing.com/particles-smaller-atom-8484470.html - 6What exactly is the Higgs boson? article physics usually has a hard time competing with politics and celebrity gossip for headlines, but the Higgs boson has garnered some serious attention. That's exactly what happened on July 4, 2012, though, when scientists at CERN announced that they'd found a particle that behaved the way they expect the Higgs boson to behave.Maybe the famed boson's grand and controversial nickname, the "God Particle," has kept media outlets buzzing. Then again, the intriguing possibility that the Higgs boson is responsible for all the mass in the universe rather captures the imagination, too. Or perhaps we're simply excited to learn more about our world, and we know that if the Higgs boson does exist, we'll unravel the mystery a little more.
- 7In order to truly understand what the Higgs boson is, however, we need to examine one of the most prominent theories describing the way the cosmos works: the standard model. The model comes to us by way of particle physics, a field filled with physicists dedicated to reducing our complicated universe to its most basic building blocks. It's a challenge we've been tackling for centuries, and we've made a lot of progress.First we discovered atoms, then protons, neutrons and electrons, and finally quarks and leptons (more on those later). But the universe doesn't only contain matter; it also contains forces that act upon that matter. The standard model has given us more insight into the types of matter and forces than perhaps any other theory we have.
- 8Here's the gist of the standard model, which was developed in the early 1970s: Our entire universe is made of 12 different matter particles and four forces [source: European Organization for Nuclear Research]. Among those 12 particles, you'll encounter six quarks and six leptons.Quarks make up protons and neutrons, while members of the lepton family include the electron and the electron neutrino, its neutrally charged counterpart. Scientists think that leptons and quarks are indivisible; that you can't break them apart into smaller particles. Along with all those particles, the standard model also acknowledges four forces: gravity, electromagnetic, strong and weak.
- 9As theories go, the standard model has been very effective, aside from its failure to fit in gravity. Armed with it, physicists have predicted the existence of certain particles years before they were verified empirically. Unfortunately, the model still has another missing piece -- the Higgs boson. What is it, and why is it necessary for the universe the standard model describes to work? Let's find out.As it turns out, scientists think each one of those four fundamental forces has a corresponding carrier particle, or boson, that acts upon matter. That's a hard concept to grasp. We tend to think of forces as mysterious, ethereal things that straddle the line between existence and nothingness, but in reality, they're as real as matter itself.
- 10Some physicists have described bosons as weights anchored by mysterious rubber bands to the matter particles that generate them. Using this analogy, we can think of the particles constantly snapping back out of existence in an instant and yet equally capable of getting entangled with other rubber bands attached to other bosons (and imparting force in the process).Scientists think each of the four fundamental ones has its own specific bosons. Electromagnetic fields, for instance, depend on the photon to transit electromagnetic force to matter. Physicists think the Higgs boson might have a similar function -- but transferring mass itself.
- 11Can't matter just inherently have mass without the Higgs boson confusing things? Not according to the standard model. But physicists have found a solution. What if all particles have no inherent mass, but instead gain mass by passing through a field? This field, known as a Higgs field, could affect different particles in different ways. Photons could slide through unaffected, while W and Z bosons would get bogged down with mass.In fact, assuming the Higgs boson exists, everything that has mass gets it by interacting with the all-powerful Higgs field, which occupies the entire universe. Like the other fields covered by the standard model, the Higgs one would need a carrier particle to affect other particles, and that particle is known as the Higgs boson.
- 12On July 4, 2012, scientists working with the Large Hadron Collider (LHC) announced their discovery of a particle that behaves the way the Higgs boson should behave. The results, while published with a high degree of certainty, are still somewhat preliminary. Some researchers are calling the particle "Higgslike" until the findings -- and the data -- stand up to more scrutiny. Regardless, this finding could usher in a period of rapid discovery about our universe.
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- Flashcards on Atom,moleculas and particles., created by Klever Ponce on 15/12/2018.
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