what are electron dense particles?
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an electron dense particle is an particle with more electrons than it has protons giving it a negative electrical charge
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Yes, they were. I believe thewy were theorized from Franz Zwichy of CalTech. They were originally called "nuetron stars", becuase they were believed to be formed when the gravity from a dying star crushed all the electrons right into the nucliae of its constituent atoms, causing the protons and electrons to "cancel out" and become nuetrons. Thus, you would get a tiny volume of pure nuetrons that was incredibly dense.\n\nIn fact, they're not sure if this really happens, but it probobly dosn't. When matter gets crushed down to those high densities, it forms what we now call a black hole, and because light cannot escape a black hole, we cn't tell what is happening inside it.
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Inside an atoms are electrons and a nucleus. The nucleus is made of protons and neutrons. The protons and neutrons are made out of things called quarks. As far as we know, quarks and electrons are fundamental, meaning they are not made out of anything smaller. There are several types of quark and under certain circumstances, they can convert from one type into another.
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Protons, Neutrons, and electrons
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If you increase the energy density (temperature) of a volume of space, particles therein collide with each other at higher speed. If things get hot enough, the collisions result in particle-antiparticle pair creation and annihilation. The hotter it gets, the fast and more numerous the particles become. The BB was a hot soup of such particles early on and, as it cooled, particles stable at low temperature were all that were left (by definition, duh). That includes the fermions we all know and love. The details of why there were apparently a net number of matter vs. antimatter particles left over is still being worked out.
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Aromatic hydrocarbons have a high electron density due to the pi cloud of electrons which exist.  They hence undergo electrophilic substitution, that is they are attacked by an electrophile.\n\nAn electrophile is an electron-loving particle, such as the positive ions and other alkyl groups (CH3, C2H5).
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Osmium is the densest element. 22.6 g/ml\nhttp://www.science.uwaterloo.ca/~cchieh/cact/c120/qzelemnt.html
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electron\nThe electron is a lightweight fundamental subatomic particle that carries a negative electric charge. The electron is a spin-1/2 lepton, does not participate in strong interactions and has no substructure. Together with atomic nuclei, electrons make up atoms; they are responsible for chemical bonding. The flow of electricity in solid conductors is primarily due to the movement of electrons.\nhttp://en.wikipedia.org/wiki/Electron\n\nThe electron, denoted  is a fundamental particle with negative electric charge that is found arranged in quantum mechanical orbits about neutral atoms. The electron is a lepton, and therefore has lepton number 1. The antiparticle of the electron is called the positron. \n\nThe electron mass is  kg, and the electron charge , where  \nhttp://scienceworld.wolfram.com/physics/Electron.html
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Electrons, which are a Fermion particles, obey the Pauli Exclusion Principle. This means in a system there can never be 2 identical fermions (in this case no 2 electrons in an atom) that occupy the same quantum state. This is different to Bosons (photons for example) where any number of bosons can occupy the same quantum state.\n\nIn a bit more depth:\nThe Pauli exclusion principle plays a profound role in a huge number of physical phenomena. One of the most important, it results in "rigidness" or "stiffness" of fermions as contrast to bosons - impossibility to squeeze identical fermions into each other - thus in "rigidness" of ordinary matter (Young and bulk moduli of solids are direct consequences of Pauli principle). Another consequence is the elaborate electron shell structure of atoms and of the way atoms share electron(s) - thus variety of chemical elements and of their combinations (chemistry). (An electrically neutral atom contains bound electrons equal in number to the protons in the nucleus. Since electrons are fermions, the Pauli exclusion principle forbids them from occupying the same quantum state, so electrons have to "pile on top of each other" in atom).\n\nFor example, consider a neutral helium atom, which has two bound electrons. Both of these electrons can occupy the lowest-energy (1s) states by acquiring opposite spin. This does not violate the Pauli principle because spin is part of the quantum state of the electron, so the two electrons are occupying different quantum states. However, the spin can take only two different values (or eigenvalues). In a lithium atom, which contains three bound electrons, the third electron cannot fit into a 1s state, and has to occupy one of the higher-energy 2s states instead. Similarly, successive elements produce successively higher-energy shells. The chemical properties of an element largely depend on the number of electrons in the outermost shell, which gives rise to the periodic table of the elements.\n\nAstronomy provides another spectacular demonstrations of this effect, in the form of white dwarf stars and neutron stars. In both types of objects, the usual atomic structures are disrupted by large gravitational forces, leaving the constituents supported only by a "degeneracy pressure" produced by the Pauli exclusion principle. This exotic form of matter is known as degenerate matter. In white dwarfs, the atoms are held apart by the degeneracy pressure of the electrons. In neutron stars, which exhibit even larger gravitational forces, the electrons have merged with the protons to form neutrons, which produce a larger degeneracy pressure. Neutrons are the most "rigid" objects known - their Young modulus (or more accurate, bulk modulus) is 20 orders of magnitude larger than that of diamond.\n\nAnother physical phenomenon for which the Pauli principle is responsible is ferromagnetism, in which the exclusion effect results in exchange energy that induces neighboring electron spins to align (whereas classically they would anti-align).
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Protons and neutrons are the nucleus so the electrons orbit in an electron cloud.
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Electron Proton neutrons
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looks like E/AMU is the charge/mass ratio of a proton.  e is usually used to represent the elementary charge (of either proton or electron) and an amu is defined as the mass of a proton.\n\nI'm not sure about the ionization density.  You'd probably want to measure the charge of the material.  Then divide the charge by the volume to get the density.
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Rutherford shot alpha particles at a think sheet of gold foil.  Since alpha particles have a positive charge (like the soon to be discovered nucleus of an atom), when the alpha particles got close to the atom's nucleus, they were repulsed away, many however just passed through, undeflected.\nThe results of this experiment showed that the majority of the atom's mass lay in a very small, dense, positively charged core of the atom, surrounded by mostly empty space and electrons.\n\nThis lead to a new model of the atom, the Rutherford model.
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Yes.\nPlasma.\nPlasma is an electrically neutral, highly ionized gas composed of ions, electrons, and neutral particles. It is a phase of matter distinct from solids, liquids, and normal gases.
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To determine density you also have to know the temperature.  The colder a substance gets, the more dense it becomes (ie. the particles come closer together).  Water is the one odd ball, it becomes most dense at 4 degree C instead of below freezing like most substances.
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Electrons are outside the nucleus of an atom and spin-random.Electrons are negative. [All matter has electrons (for the sake of agument)]\n\nMagnets-the 2 poles-electrons spinning in one direction at one end and the other direction at the other end.Positve and negative.\n\nElectricity-electrons travelling along a wire from the source like a chain reaction bumping the electron to electron ( current) to its final destination.\n\nMedical (diagnositc) xray production-a low voltage current is applied inside the xray machine-which causes the loss of electrons off a wire, these "free electons"(in a vacuum)negatively charged then travel high speed across inside the vacuum tube to a positive "plate". When the electrons hit this plate, their energy ends with the release of an x-ray.\n \nAn MRI (Magnet Resonance Imaging)of a person-a powerful magnet lines up the electrons of a persons body. When the magnet is turned off-the release of the electrons to again begin their spinning releases an xray from the persons's body.\n\nElectomagnet-a magnet wound with coil which when current is applied increases the magnetism. Example of how junk cars are picked up -electric current running around the magnet, magnet picks up car,car is moved to the top of the heap and the current turned off-boom-no more magnet-car drops.\n\nYou can make a magnet with electricity and electricity with a magnet.\n\nElectronics involve use of electrons. Remember they are free spinning little boogers. \n\nMagnets temporarily interfere with the spin of the electrons.
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1) *more info?\n2) microscopy\n3) electron