how is an atom described today
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- Modern Atomic Theory Bohr's model of the atom is important because it introduced the concept of the quantum in explaining atomic properties. However, Bohr's model ultimately needed revision becuase it failed to explain the natue of atoms more complicated than hydrogen.rwin Schrodinger developed the equation which is used today to understand atoms and molecules-the Schrodinger Equation (1926) Erwin Schrodinger took the ideas developed by de Broglie, Heisenberg and others and put them together in a single equation that is named after him.
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- Atoms are really small! Some atoms have more protons, neutrons, and electrons, and some have fewer. Depending on how many protons and electrons an atom has, the atom behaves differently. The simplest atoms have just one proton and one electron-that's a hydrogen atom. A bunch of these atoms together make hydrogen gas. More complicated atoms have more protons, more neutrons, and more electrons.
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Questions and Answers The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus. A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron. If you had very, very good eyes and could look at the atoms in a sample of hydrogen, you would notice that most of the atoms have no neutrons, some of them have one neutron and a few of them have two neutrons.
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- Atomic theory. Atomic theory is the scientific theory of the nature of matter. The theory states that matter is made up of small particles called atoms. Prior to this theory, matter was thought to be able to be divided into any small quantity. The word atom is derived from the Greek atmos, meaning indivisible.
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- Atoms are made up of protons, neutrons and electrons, also known as subatomic particles. Because an atom is neutral, the number of electrons is equal to the number of protons. Electrons circle the nucleus, which is made up of protons and neutrons.
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What is an Atom? 1 Atoms are made of extremely tiny particles called protons, neutrons, and electrons. 2  Protons and neutrons are in the center of the atom, making up the nucleus. 3  Electrons surround the nucleus. 4  Protons have a positive charge.  Electrons have a negative charge.
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Atoms Are Building Blocks Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
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- An atom is made of protons, neutrons and electrons. The neutrons and protons are bundled up in the nucleus or center of the atom. The electrons on the other hand fly around the nucleus in a big cloud. It might help to think of electrons as social little creatures.
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- What are atoms? Atoms are the basic building blocks of matter that make up everyday objects. A desk, the air, even you are made up of atoms! There are 90 naturally occurring kinds of atoms. Scientists in labs have been able to make about 25 more. Click here to continue
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Atom If an atom has more or fewer electrons than its atomic number, then it becomes respectively negatively or positively charged as a whole; a charged atom is called an ion. Electrons have been known since the late 19th century, mostly thanks to J.J. Thomson; see history of subatomic physics for details.
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Atomic theory The modern model of the atom describes the positions of electrons in an atom in terms of probabilities. An electron can potentially be found at any distance from the nucleus, but, depending on its energy level, exists more frequently in certain regions around the nucleus than others; this pattern is referred to as its atomic orbital.
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- An atom is the basic unit that makes up all matter. There are many different types of atoms, each with its own name, mass and size. These different atoms are called chemical elements. The chemical elements are organized on the periodic table. Examples of elements are hydrogen and gold. Atoms are very small, but the exact size changes depending on the element. Atoms range from 0.1 to 0.5 nanometers in width. One nanometer is about  100,000 times smaller than the width of a human hair.
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- 1 Atoms are made of extremely tiny particles called protons, neutrons, and electrons. 2  Protons and neutrons are in the center of the atom, making up the nucleus.  Electrons surround the nucleus.
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Atom Atoms consist of electrons [electrons: Sub-atomic particles, with a negative charge and a negligible mass relative to protons and neutrons. ] surrounding a nucleus [nucleus: The central part of an atom. It contains protons and neutrons, and has most of the mass of the atom.] that contains protons protons: Sub-atomic particles with a positive charge and a relative mass of 1. and neutrons neutrons: Uncharged sub-atomic particles, with a mass of 1 relative to a proton. .eutrons are neutral, but protons and electrons are electrically charged. Protons have a relative charge of +1, while electrons have a relative charge of -1. The number of protons in an atom is called its atomic number.
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Questions and Answers Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. Protons and neutrons are both composed of other particles called quarks and gluons.
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atom atom. 1  Physics. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element. 2  Energy.
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Atom 3.3.1 - The Bohr Model of the Atom. Electrons are always moving around the nucleus and so possess potential and kinetic energy. But they can only possess certain values of energy, or specific energy levels.ccording to Bohr's model of the atom, electrons orbit about the nucleus much like the way planets orbit the sun. Different energy levels are associated with the different orbits. The diagram below shows the Bohr model for fluorine.
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All About Atoms Atoms are the basic building blocks of matter that make up everyday objects. A desk, the air, even you are made up of atoms! There are 90 naturally occurring kinds of atoms. Scientists in labs have been able to make about 25 more. Click here to continue.
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Energy, Plants & Man This way, the modern quantum theory was developed in the early 20th century. As we have already seen, quantum physics mainly deals with waves and the subatomic particles (electrons, protons and neutrons) of matter. This is the reason, quantum theory is also referred to as quantum wave mechanics. Following are the major points that are covered in the modern quantum theory:
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- The text provides a historical perspective of how the internal structure of the atom was discovered. It is certainly one of the most important scientific discoveries of this century, and I recommend that you read through it. However, we will begin our discussion of the atom from the modern day perspective.
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- By Andrew Zimmerman Jones. Definition: An electron is a fundamental particle, which means it cannot be broken into smaller particles. Electrons may be bound in the electron cloud surrounding an atomic nucleus, or may break free from the cloud as a free electron..
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electron Although it has mass, the electron has no size: it is described as ‘pointlike’. Electrons are constituents of all atoms, moving around the central nucleus. They can also exist independently. The antiparticle of the electron is the positron, symbol e + or ē. Electron
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CHEMISTRY I: ATOMS AND MOLECULES Energy is the capacity to do work. Matter has mass and occupies space. All matter is composed of basic elements that cannot be broken down to substances with different chemical or physical properties. Elements are substances consisting of one type of atom, for example Carbon atoms make up diamond, and also graphite. Pure (24K) gold is composed of only one type of atom, gold atoms. Atoms are the smallest particle into which an element can be divided.
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- Atoms and Elements. Ordinary matter is made up of protons, neutrons, and electrons and is composed of atoms. An atom consists of a tiny nucleus made up of protons and neutrons, on the order of 20,000 times smaller than the size of the atom. The outer part of the atom consists of a number of electrons equal to the number of protons, making the normal atom electrically neutral. A chemical element consists of those atoms with a specific number of protons in the nucleus; this number is called the atomic number. The atoms of an element may differ in the number of neutrons; atoms with different neutron numbers are said to be different isotopes of the element.
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Atomism This philosophy has found its most successful application in natural science: according to the atomistic view, the material universe is composed of minute particles, which are considered to be relatively simple and immutable and too small to be visible.
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- Earliest Atomic Ideas - Aristotle disagreed with Democritus's ideas about atoms and wrote about it a lot. Leucciopus and Anaxagoras had both thought of the atomic theory before Democritus, but he was the one who built on it and improved it.e called these pieces atoms. Todays theory comes from the ideas of John Dalton's theory. His theory was the basis for what we know today. Today we are able, with new high tech experiments, to see what the atom is made of-the tiny parts such as electrons, protons, and neutrons.