Why is +19 the nuclear charge of potassium-39?
93784
The nuclear charge depends on the positively charged protons. Potassium has 19 protons and 20 neutrons. So, this makes the nucleus +19 and the mass of the atom 39 (19+20).
921926
mg + ion\no -ion\nk +ion\ns -ion\nwhen they are 'added' together (MgO and K^2S) the charges are balanced, that means that the net charge is 0.
1131979
OK.  There was a discrepancy in the atomic mass of elements.  We have electrons, which have insignificant mass, and an equal number of protons (to make the atom neutral), but the atomic mass exceeds the sum of the masses of the protons + electrons.  So we hypothesize that there is another particle in the atom which has atomic mass roughly the same as a proton but no charge.\nIt makes sense that this particle is in the nucleus.\nBUT, we can't use magnetic properties to isolate this particle.  And an atom is pretty much indivisible.  So we must actually strip off the electrons AND the protons to isolate neutrons.  That's not easy.
664696
The atomic number is equal to the number of electrons in the atom - therefore there are 28.However, since you have a postive 3 charge, there must only be 25.\nNow normally, the number of electrons would equal the number of protons, but since you have a charge of +3, that means that there are three less electrons than protons(you don't lose protons until you get into radioactivity, and it doesn't soung like you're there yet), so that means that you have 25 electrons and 28 protons.\nThe atomic mass is defined as the number of protons + the number of neutrons, so you have 60 = 28 + (number of neutrons). Therefore, you have 32 neutrons. Good Luck!
199784
electrons have negative charge
493740
no they r not named...k,l,m,n are shellls...k is nearest to the nucleus....k can support 2 electrons, l can support 8,m can do 18 but in some cases it is 8 and n can support 32.
840804
Others ways to change an element (nuclear chemistry)\n\nProton emission \nK^40 ------> Ar^40 + e\n\nElectron Capture.\nHg^197 + e-  ------->  Au^197\n\nAlpha Radiation 4/2He+2\nU^238 ----->  (4/2He2+) +  Th^234\n\n\nBeta Radiation which causes a neutron in the nucleus to spontanously decay into a proton pluse an electron which is then ejected\n\nI^131 ------> Xe^131 +  e-
679382
Jaleesa, I think that you can use the same principle that I explained in the earlier question. The Sodium ion has fewer electrons and fewer shells, and is thus smaller than the potassium ion. But I think you should do the rest of your homework yourself.
157477
In the nuclear atom,the +ve charges are at the center of the atom while the electrons revolve around it. In unform sphere, the electrons are taken to be embedded in a +ve sphere
979618
Mg2+ and not Mg2-\nThis ion lacks 2 electrons to be neutral, so it is positively charged.
290665
3.45×10^−25 kg = Lead-208 atom, the heaviest stable isotope known\n\ncheck here http://en.wikipedia.org/wiki/Orders_of_magnitude_(mass) good luck
862596
K2SO4\nCa(NO3)2\n\npotassium has a +1 charge and sulfate has a -2 so therefore you need 2 potassiums so that you can have a net zero charge.\ncalcium has a +2 charge and nitrate has a -1 charge so you need two nitrates to balance the charges
109271
This is from Mr. Jeffy:\n\nIf you know that 60.4% of the naturally occuring isotopes have an atomic mass of 68.9257 amu, then you know that the other 39.6% much have an atomic mass such that the averge is 70.9249 amu.\nSo,\n(60.4% of 68.9257) + (39.6% of x) = 70.9249\nSo solve for x.\n============================================================\n\nI think he merely switched a couple of terms here, so I think the equation will look like this:\n\n(60.4% of 68.9257) + (39.6% of 70.9249) = x\n\nSolving:\n\n41.6311228 + 28.0862064 = (approx.) 69.72\n\nYou have gallium (Ga), my friend.
52468
it is the charge of an electron 1.602*10^-19 Coulombs, i think that is what you are referring to.
703814
211_____207_____4\n      Bi  -->__Tl +____a    (a helium nucleus) \n83_______81_____2
770649
94,240Pu ---> 40,93Zr + 54,144Xe + _3_ 0,1n\n\nThe first number is the proton number, the second is the nucleon number. Both of these must be conserved in fission. As the number of protons is already conserved, the difference in the nucleon number must come from free neutrons.
199003
a proton has a weight of approximately 1836.15 electrons