Why do only two charges exist in nature ?
542625
It's either just one charge: The electrical, which appears in positive and negative characteristics, or if you see "charge" in a more general way it's more then one charge: magnetism has also a source, but that appears always in dipoles, mass is the "charge" of gravity, but that appears just with a positive sign, and the strong interaction has three kind of charges, called "colour charges": red green and blue.\n\nTwo see an underlaying principle for this "chaos" we need the "Grand Unified Theory" which still is "work in progress" ;)
694183
First of all, since E = mc^2, you cannot have two massive, energyless bodies.  Secondly, by definition, they have a potential energy of \n.. R\n ∫(-GM1M2/R^2)dR, or GM1M2/R\n. 0\nwith respect to each other, so, again, they cannot be energyless.
526886
In order:\n\n1) Red, blue, and green colour charges are distinct, but arbitrary, exactly like + and - electrical charges.  There is a difference between something positively charged and something negatively charged.  With quarks, it's simply that there are three different kinds of charge, instead of just two for electromagnetism.\n2) Because gluons are, themselves, influenced by the strong force, a correct description of the quantum force diagrams (penguin diagrams, if you know that term) must necessarily include higher order interactions than simply quark <-> gluon <-> quark.  The one you propose is, I believe, possible by the rules governing the quantum behaviour of quarks and gluons, as are many, many more distinct diagrams.\n3) There is no meaningful order.  RBG and RGB are both "colourless".\n4) String theory is outside of my area of expertise, I don't think I can address this issue in any meaningful way.
184932
Nobody knows WHY electrons only exist in descrete rings.\nThe quantum physics only describles the facts but does not explain why.
859901
Aside from the fact that particles having opposite electrical charges do NOT constitute the definition of "anti-matter", you also do not find free quarks roaming around, so it would be difficult for any quark to find another quark of opposite charges. By "free quark", I mean quarks that are not confined inside a proton, neutron, or other massive particles made from quarks. The reason we don't find free quarks is because the "Strong" force (which is responsible for keeping the atomic nucleus together and also for keeping quarks confined) is a force whose strength grows stronger as the particles gets further apart. That's right! This is exactly the opposite of all other forces.
754778
Yes, to my knowledge.  BaCl2 creates oppositly charged ends, and opposites attract, much like NaCl would do, but just a tad different.
17600
the person before me solved for the capacity, which is how much charge the earth can hold, not how much charge it is actually holding.\n\nthere is no way to know for sure how much charge is on the earth's surface, it's too big, and it is constantly changing.  Charged particles go up into the atmosphere all the time, and everytime there's a lightning storm, it changes dramatically at one time, and there's no way to really measure how much charge is there at any given time.  Plus, it's not really 'charged' becaue it is so big and has so little charge compared to its mass, which is why it can act as a 'grounding' and not be affected when large amounts of charge are put into it, because they are still small charges relative to the mass of the earth.  it is impossible to calculate the total charge on the entire earth at any given time.
385141
One Coulomb represents the Energy of Electrons moving with a power of one Ampere for one Second  \nIt takes a number of 6.241506363 * 10^18 Electrons\nTo develop that Energy .\nIf you assume that electrons are running horses you would say thats quite a Charge!
841451
Why all the writing?\n\nThe first energy level can hold a maximum of two electrons. All but H and He have more than two electrons.\n\nGet an "A".
4764
You can't balance it because you don't know what it yields.\n\n\nP.S. This needs to be in the chemistry category. You really must not know much about chemistry and physics.
963196
Many molecules have a lot more than two. You just have to keep counting. Don't forget the green ones.
36755
An atom has no charge because it likes to be stable and to be stable it has the same number of protons (positively charged particles)as it has electrons (negatively charged particles) therefore they cancel each other out of course sometimes they are not stable and are called ions which are charged atoms
1142596
both positively and negative atoms have affinity for each other\n\nthis is due to the reason that each of them has few +ve particles \nand few -ive particles.this attract each other due their affinity\nbut both +ve and -ive atoms have protons(+ve particles) and electrons (-ive particles) in higher number therefore its always an over coming force this gives rise to an attraction or repelling force respectively on opposite and same type of charge
332902
Don't read too much into this.  The simple truth is that there is no reason, this only convention.  If you want to call protons negative charges and electrons positive charges, that will have absolutely no effect on the science, just as long as you're consistent.  Conventions like this one are set up to alleviate confusion in the community, but there is no greater, cosmic purpose.\n\nYou will run into similar conventions when talking about the sign of electric current (defined as the flow of positive charge, which is counter-intuitive since the electron is conventionally negative and it is the electrons that actually move), the sign of energy differences/heat flow (positive if moving into the system from the surroundings), and several other physical quantities.
263220
1 but it prefers two, as do all atoms prefer to mimic the noble gases.  For instance, if a hydrogen is in a bond it actually has two electons that orbit its nucleus.
391662
There are two types of charges positive and negative.\n\nAll objects have equal number of charges in general.\n\nWhen the net charges are equal to zero, the body  is in neutral.\n\nBy various methods like friction, we can remove one or other type of charges from an object.\n\nThen an object is either positively charged or negatively charged.\n\nIn this state, the charges, residing in the object are rest; Static.\n\nThe study of these behaviors of charges at rest is Static Electricity.
979618
Mg2+ and not Mg2-\nThis ion lacks 2 electrons to be neutral, so it is positively charged.