What ions would you find in the crystal structures of MgO and K^2S?
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.
1139103
There is a LIST of them in the link below:\nhttp://www.alltheinternet.com/texis/open/all?q=lewis+structure+of+ions
857176
S(s) + O2(g)------>SO2\n\n2Mg(s) + O2(g) -------> 2MgO(s)\n\nH2(g) + Br2 (g) -------> 2HBr(g)\n\n4Fe(s) + 3O2 -------> 2Fe2O3 (s)\n\nThen there are single replacement \n\nA + BC-------> AC + B\nZn(s) + 2HCl(aq)------->ZnCl2 (aq) + H2 (g)\nwhere one element replaces another\n\nthen there is double replacement \n\nAB+CD -------> AD + BC\n\nIn this one the positive ions in the reacting compounds switch places\n\nBaCl2 (aq) + Na2So4 (aq) --------.BaSo4 (s) + 2NaCl (aq)
752683
a) sulfur tetrafluoride\nb) molybdenum tetrachloride\nc) cobaltous sulfide or cobalt sulfide\nd) SnO\ne) ferric chloride\nf) CrO3\n\nComment: the above names are the ones you're most likely to encounter in industry or in a real-world laboratory.  Few chemists out here would call FeCl3 "iron three chloride"!\n\nOh, I know, your teacher probably expects "sulfur (IV) fluoride, molybdenum (IV) chloride, cobalt (II) sulfide, and iron (III) chloride..."
106182
Actually its MgO. Magnesium is a bivalent metal Mg(2+) and Oxygen has a charge of O(2-) so they form a very strong 1:1 bond.
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
940685
Link to a picture of Potassium:\nhttp://en.wikipedia.org/wiki/Image:K%2C19.jpg\n\nPotassium\n \nGeneral \nName, Symbol, Number potassium, K, 19 \nChemical series alkali metals \nGroup, Period, Block 1, 4, s \nAppearance brownish white\n \nAtomic mass 39.0983(1) g/mol \nElectron configuration [Ar] 4s1 \nElectrons per shell 2, 8, 8, 1 \nPhysical properties \nPhase solid \nDensity (near r.t.) 0.89 g·cm−3 \nLiquid density at m.p. 0.828 g·cm−3 \nMelting point 336.53 K\n(63.38 °C, 146.08 °F) \nBoiling point 1032 K\n(759 °C, 1398 °F) \nCritical point ( K, {{{mpa}}} MPa \nCrystal structure cubic body centered \nOxidation states 1\n(strongly basic oxide) \nElectronegativity 0.82 (Pauling scale) \nIonization energies\n(more) 1st: 418.8 kJ·mol−1 \n2nd: 3052 kJ·mol−1 \n3rd: 4420 kJ·mol−1 \nAtomic radius 220 pm \nAtomic radius (calc.) 243 pm \nCovalent radius 196 pm \nVan der Waals radius 275 pm \nMiscellaneous \nMagnetic ordering  ? \nThermal conductivity (300 K) 102.5 W·m−1·K−1 \nThermal expansion (25 °C) 83.3 µm·m−1·K−1 \nSpeed of sound (thin rod) (20 °C) 2000 m/s \nShear modulus 1.3 GPa \nBulk modulus 3.1 GPa \nMohs hardness 0.4 \nBrinell hardness 0.363 MPa \nCAS registry number 7440-09-7 \nSelected isotopes \nMain article: Isotopes of potassium iso NA half-life DM DE (MeV) DP \n39K 93.26% K is stable with 20 neutrons \n40K 0.012% 1.277×109 y β- 1.311 40Ca \nε 1.505 40Ar \nβ+ 1.505 40Ar \n41K 6.73% K is stable with 22 neutrons \n \nReferences \nPotassium (IPA: /pə(ʊ)ˈtasiəm/) is a chemical element. It has the symbol K (Latin: kalium) and atomic number 19. The name "potassium" comes from the word "potash", as potassium was first isolated from potash. Potassium is a soft silvery-white metallic alkali metal that occurs naturally bound to other elements in seawater and many minerals. It oxidizes rapidly in air and is very reactive, especially towards water. In many respects, potassium and sodium are chemically similar, although organisms in general, and animal cells in particular, treat them very differently.\n\nContents [hide]\n1 Notable characteristics \n2 Applications \n3 History \n4 Occurrence \n5 Isotopes \n6 Precautions \n7 Potassium in nutrition and medicine \n8 See also \n9 References \n10 External links \n \n\n\n[edit] Notable characteristics\n \nThe flame testWith a density less than that of water, potassium is the second least dense metal after lithium. It is a soft, low-melting solid that can easily be cut with a knife. Freshly cut potassium is silvery in appearance, but in air it begins to tarnish toward gray visibly and immediately. Potassium must be protected from air for storage to prevent disintegration of the metal from oxide and hydroxide corrosion. Often samples are maintained under an inert medium such as kerosene.\n\nSimilar to other alkali metals, but more so than lithium and sodium, potassium reacts violently with water producing hydrogen. The reaction is sufficiently exothermic that the evolved hydrogen gas ignites.\n\nK + H2O → ½ H2 + KOH \nBecause potassium reacts quickly with even traces of water, and its reaction products are nonvolatile, it is sometimes used alone, or as NaK (an alloy with sodium which is liquid at room temperature) to dry solvents prior to distillation. In this role, it serves as a potent desiccant.\n\nPotassium is an essential element for all living organisms.\n\nPotassium and its compounds emit a violet color in a flame. This fact is the basis of the flame test for the presence of potassium in a sample.\n\nPotassium compounds generally have excellent water solubility, due to the high hydration energy of the K+ ion. Potassium ion is colorless in water.\n\nPotassium may be detected by taste because it triggers all the types of tastebuds, according to concentration. Dilute solutions of potassium ion taste sweet (allowing moderate concentrations in milk and juices), while higher concentrations become increasingly bitter/alkaline,
910345
The formula would be Al2(CO3)3; the numbers are subscripts. \n\nLearn your charges for the polyatomic ions and for the other elements, it will really help.
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.
640052
looks like potassium chloride, Magnesium chloride, Sodium Nitrate, and Water... Is this what you are looking for?
739878
I am not sure what you are asking but the answer could be a monoatomic ion. The positive being a cation and the negative being an anion.\n\nYou might ask over at http://forums.mychemistrytutor.com though.
797121
The answers are KCl, CaF2, and Na2O. Potassium has one electron on the outer ring while chlorine has seven. To make chlorine's ring "full" potassium gives the one electron to chlorine. They are "happy" now. :) That's what my science teacher told me. He's weird.
977750
Mn(+3) has the electronic configuration of 1s(2) 2s(2) 2p(6) 3s(2) 3o(6) 3d(2)\n\nthe one before me missed the 4s2 so his is wrong
979618
Mg2+ and not Mg2-\nThis ion lacks 2 electrons to be neutral, so it is positively charged.
178817
manganese(II) sulfate (MnSO4)
720109
Mn2+ is the common ion
853340
KCl + Cu(Cr2O7)\n\nDichromate has 2 Chromium +6s to counter the 7 oxygen -2s.  +2 + -2 = 0\n\nPotassium Chlorite and Copper Dichromate