how many electrons in the universe?
97491
In order to estimate the number electrons you have to calculate the number of mass stucture from the Periodic  Table of elements determine the number of electrons. Than you have to take the average value of the electron mass(Note if universe is not homogeneous than electrons would have different masses at  different radii in the Universe.)\nDo the same for protons and neutrons and for the free particle masses that are roaming around between galaxies.\nCalculate the difference.Than take the total estimated mass of the Universe and divide it by that difference.\nAs you can see its not an easy task; Since the mass of the Universe is 2^53 kg,is really a rought estimate and is not exatly a determinate value. The electron mass on earth at standard temperature & pressure was measured to be 9.1^-31 kg. It would vary at different temperatures and pressures.\nYour question may blow the mind of some smart people!\nI personnally I am not such of a Genious that I could come up with a number.
24017
With modern chemistry and quantum physics knowledge, we know 104 elements. \n\nAn element is defined by proton count, which in turn determines the number of electrons in orbit. Hence we know we aren't missing any elements in between, all numbers between 1 and 104 are known.\n\nThis leaves elements with proton counts of 105 or greater. The greatest difficulty in identifying these is that they are extremely unstable. The observer needs to be lucky and skilled to observe one of these superheavy elements before it decays.\n\nEven more so since these elements are produced by colliding heavy ions at high speed, creating lots of  energy at the collision. Capturing such an element and identifying its mass charge ration in a mass spectrometer or getting spectroscopical data that can be fitted to the theoretical energies one would expect is hard under these circumstances.
952552
assume 10^11 stars in 10^11 galaxies at 2x10^33 grams each per star and ~4.6x10^23 atoms/gram (remember, the uni is 10% helium).  This'll get you within an order of magnitude or so.\n\nNote that this is number of ATOMS which appear to represent perhaps only about 5% of the total mass of the universe, most of the rest being dark matter (25%) and dark energy (~70%).
928403
You must be one of those people who only believe in things they can tactilely handle.  The world of incredibly small objects will be a philosophical challenge, but I'm sure you're up to it.   \n\nFirst, let me give you the short and easy answer:  \n\nThe entire universe runs on a few very simple mathematical equations.  The solution of these equations is extremely difficult, but they perfectly predict and describe physical reality (when solved perfectly), so we're pretty happy with them.  \n\nMathematically speaking, orbitals and electrons exist, and because they exist and have certain properties, they must obey certain rules.  One of those rules is that only two electrons can ever fit into the same orbital, and they have to have opposite spin.  Any random orbital may have zero, one or two electrons but no more because if you tried to shove a third (or more) electron into an orbital, the orbital would vanish.  Think of it this way... its the only way that the elctrons can forever coexist without ever crashing into each other or falling apart in a chaotic state, because electrons (by Coulomb's law) HATE each other and strive to maintain maximum distance from one another while all trying to get close to the positively charged nucleus, which they LOVE.\n\nNow for the long answer:\n\nBefore you can accept that two electrons go into an orbital, you need to be able to accept that electrons exist.  JJ Thompson is credited with discovery (though not postulation of) the electron in his famous cathode ray experiments.  Electrons are evidenced regularly on a macroscopic scale through the use of electricity (the name is not coincidental!) and in such interesting objects as scanning tunneling microscopes and electron microscopes.  Robert Miliikan managed in 1901 to measure the charge on the electron in his oil-drop experiments.\n\nAn important piece of information came through Ernest Rutherford's (and his students Hans Geiger and Ernest Marsden) experiments on gold foil wherein they demonstrated that the mass of an atom resided in a small region of space in its center, which had a positive charge.  Later, Niels Bohr proposed that electrons reside in orbits around the nucleus, which would contain the protons and neutrons (both already demonstrated to exist independently).  The usefulness of Bohr's model was widely realized because it could predict experimentally observed phenomena, such as why atomic emission spectra have discrete lines while blackbody radiators give broad spectra.  \n\nA key moment in Bohr's theory was the existence of discrete energy states (that is, well-separated) that electrons could exist in.  The electrons could change energy levels, but could not occupy any energy states between those energy levels. The idea was hardly unique to Borh, having originated with Max Planck and Albert Einstein in reference to photons; yet its application to the atom was Bohr's own contribution.\n\nThis theory was pretty good, but it was a little rough.  Many very good physicists decided to work on the combination, including Paul Dirac and Erwin Schrödinger.  The final equation describing the behavior of quantum systems (and in particular atomic structure and the resultant properties) is known as the Schrödinger equation.  Solution of the Schrödinger equation provides perfect agreement with experiment (i.e. Balmer series of hydrogen) where the solution is exactly possible, and within experimental error where it is not. The Schrödinger equation is a simple, elegant, yet frighteningly hard mathematical equation relating the energy of a system to its wavefunction descriptor (remember, Einstein already showed wave-particle duality):\n<Ψ | H | Ψ > = E\n\nMax Born showed that if you multiply the wavefunction ( Ψ) from the Schrödinger equation by itself (i.e. Ψ*Ψ ) you will get a shape that corresponds to the region of space in which electrons that can exist in that level of energy (wavefunction) mo
969429
92 protons and 92 electrons\nIsotopes have a different number of electrons
5355
No one knows.\n\nThere are about 10 planets in our solar system, depending on whom you ask.\n\nAround 100 planets have been detected in other solar systems.\n\nThere are at least 200 billion stars in the Milky Way Galaxy (ours).\n\nIf the average number of planets per star is 10, then there are 2000 billion or 2 trillion planets in our galaxy.\n\nNo one knows how many billion galaxies are in the Universe.
945388
density,volume,weight,number of electron and proton.
385472
Our Universe is the only one that we know of.  Within our universe are at least a hundred billion galaxies.  Within our galaxy (assuming it is normal) there are a hundred billion stars.  That gives us (assuming the averages hold true) roughly 10,000,000,000,000,000,000,000 (ten sextillion) stars in the known universe.
866619
It would take about 57000 Earths to span the classical diameter of an electron.\n\nThe universe has been in existence for 1.37E+10 years.  It would therefore be somewhere around that many lightyears in radius.  That's 1.296E+23 kilometers.\n\n(In fact, the universe is probably larger than this because of the inflationary expansion during which space appeared as a consequence of the relaxation of the primordial energy that created the universe to begin with.)\n\nEarth's radius is 6378 kilometers, which means that it would take 2.032E+19 Earths to span across the universe.\n\nOn a scale at which the universe is one meter wide, Earth's radius would be 4.921E-20 m.  The classical radius of an electron is 2.82E-15, so the electron (in the real world) would be (classically speaking) 57000 times wider than Earth (in the model).\n\nHowever, the Planck length is 1.616E-35 meters, and so even the scaled down Earth is still 3.045E+15 Planck lengths in radius.  If the Planck length were scaled UP by the same amount, it would still be only about 21 Angstroms long: about the wavelength of x-rays.
515033
The most abundant element in the universe is hydrogen.  Nebulae are made up most of that and "dust".
859865
Yup.  That's right.  Electrons are generally located in diffuse shells arranged around a very dense nucleus.  All matter on earth is basically empty space.  Do searches under "Rutherford atom" and "neutrinos" for more information.
365377
atomic number represents the number of protons or electrons in an atom
271980
The Earth is in the Solar system, the solar system is in the Galaxy and the galaxy is in the Universe AKA outer space. The answer to your question is not known, some say the Universe is the end of that line, stuff is made of atoms, atoms are made of protons, neutrons and electons, protons, neutrons and electrons are made of quarks, which are made of (I think) gluons, huons and mesons. I think that their is another universe, say a ten or eleven dimensional universe, that holds infinitely more four dimesional universes, like ours, this is part of string theory.
533282
earth= 5 billion, sun= 7 billion, sky ie universe= 12 billion\nmoon= 4 billion
259918
um  well its a sphere in the center. that contains 13 protons (atomic number is number of protons), and 14 neutrons (mass number - atomic number) and it has lil orbitals around it. basically circles. and on the closest one to the center, theres 2 lil electrons orbiting. on the 2nd from centre, theres 8 electrons orbiting. and on the next one, theres 3  (if 13 protons, then 13 electrons. cuz not charged) and then thatz it.
46736
Find the number of protons. Then number of electrons = number of protons.
807009
there are innumerable protons and neutrons in universe. generally protons and neutrons are in an atom.