why does electrons have negative charge?
115323
To explain many chemical process it is necessary to assume charged particles inside atom & also to explain the structure it is necessary to assume charged particles.As it has been assumed that there is positively charged particles -protons in center of atom it  is necessary to assume negetively charged particles which are called electrons.
841477
Cations are positive, and are attracted to the cathode, which is negative.
253094
High low is relative and unimportant, Polarity is what matters. You do not allow for the answer opposite potential energy, which is the correct answer an electron has a negative charge and will move towards a positive potential. if you are referring to an electron in an atom at a particular quantum level it will remain at that level until acted upon by an outside force if this force adds energy it will move to a higher energy level, vise-verse. If you want people to take the time to answer a question take the time to define it well!
120108
It means that the overall charge of the atom is 0. This is because, in the standard make up of an atom, there is an equal number of protons and electrons, all of which have an equal but opposite charge, cancelling each other out.
27625
Typically the metals and hydrogen. Non-metals usually give negative ions.
36089
Don't take that idea too literally.  The idea that atoms have electrons, which are on the outside, and are negative, is just a model.\n\nPeople used models, such as the idea that atoms are composed of negatively-charged electrons spinning around a nucleus composed of positively-charged protons and electrically neutral neutrons, because the models were found to be useful in explaining or perhaps even predicting certain behavior or phenomena.  When conditions were found that were not consistent with that model, new models were devised.\n\nThe model you are talking about is now considered to be obsolete.  See the references linked below.
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
376617
Physicists have chosen to define the amount of charge that an electron carries as one. Since an electron is negatively charged, it becomes -1, as opposed to the +1 charge that a proton carries.
1139565
Protons are positive, electrons are negative, neutrons ane neutral. \n\nAn atom with more elctrons than protons is negative, an atom with fewer electorns than protons is positive. The two oppositely charged atoms attract. example NaCL\n\n\nThe exception being certian atoms who share valence (outer shell) electrons in order to become neutral. example H2, O2\n\n\nClear as mud?
246818
Here is the easy answer:\nCations are formed by losing electrons.  When comparing the relative numbers of electrons to protons, there will be more protons (because electrons were lost).  Protons are positively charged... since there are more of them compared to electrons, the cation will have a positive charge.
721773
Yes, it does. A negatively charged object is heavier than a positive one. However, this difference is amazingly small that it's hard to even comprehend let alone measure.\n\nEDIT: To the guy below me, although the positron is a recognised particle they do not magically appear to replace a lost electron - a positive object is lighter. See link for a workthrough and proof.
191266
Their charge is equal but a proton has a positive charge and an electron has a negative charge.
383164
basic answer: if the scope is charged, that means there are an excess of like charges all stuck together. like carges repel, but they have nowhere to go since there are no conductors around. you're body, mostly water, is a decent conductor, so when you touch it, the charges are free to move farther apart from each other by going into your body. the charges leave the scope until the excess charge is neutralized.\n\nmore accurate: actually, positive charges don't move, since positive protons are stuck in the atoms, but negative electrons are free to move in a conductor. when something is positively charged, it didnt gain positive charge, but lost electrons. when you neutralize it, electrons flow FROM your body to the scope. this is really the same as a net positive charge leaving the scope, but that isnt whats actually happening at an atomic level
515612
Atoms do not have a charge.\nIons have a charge (either plus or minus)
428919
Basically, all atoms contain positive proton particles and negative electron particles. If protons outnumber electrons then the atom has a positive charge. If there are more electrons than protons then it has a negative charge. Usually, positive atoms and negative atoms cluster together effectively cancelling each other out, but in a magnet they don't. You get all the positive atoms at one end and all the negative atoms at the other. The charge causes it to stick to iron, which will eventually becomes magnetised too as it loses or gains electrons form the magnet.
689936
electron is Negatively charged particle that revolves around the nucleus of an atom.IT shows dual character i.e; it has both wave character and particle character...one electronic charge is 1.609 * 10^-19......the wave length of an electron can be found using the formula lamda= h/mv..where h is the plank's constant 6.626*10^-34...m is mass of an electron 9.1*10^-31...v is its velocity...when supplied energy it gets excited and moves to high enegry orbital...then slowly radiate the energy and then move to their position...these radiations araethe colours seen when we heat substances...the color is due the wavelength of the radiations....the energy of an electron at infinity is 0...when it is near the nuclues...it does some work and energy is spent therefore near the nucleus he charge of an electron is -ve...thats all i can  remember...hope you slect mine...thanks....
595444
they're not ions actually. they're positive and negative charges