for eg. which of the following has the max magnetic moment?Mn2+,Fe2+,Ti2+,cr2+
204717
Use the formula:\n\nmagnetic moment = sqrt(n(n+2)\nwhere n = number of unpaired electrons.\n\nEg Mn has 5 d electrons, therefore, Mn2+ could have a maximum of 3 unpaired electrons. Plugging 3 into the above formula gives:\n sqrt(3(3+2) = sqrt(15) = 3.87 BM.
19370
well, the magnetic dipole moment of a loop is given by mu = I*A where I is the current and A is the area of the loop.  so, to maximize the area for a given perimeter, i think you want a circular loop.\n\nhttp://www.faculty.fairfield.edu/jmac/ther/superlatives.htm\n\nas for whether to make a single loop or lots of loops, consider how much area you get for a wire of length L.  the circumference of a circle is C = 2*pi*r, and the area is A = pi*r^2.  solve the first equation for r and plug it into the formula for area, and you get A = C^2/4pi.  here C is simply the length of wire you use.\n\nso, if you make N loops of length L, then you get a total effective area of N*A.  but, if you make a single loop of length N*L, then you get a total area of (N*L)^2/4pi = N^2 * A, which is a factor of N more area than the case with N loops.  \n\nit's because of the r-squared term in the area - as you increase the amount of wire, the area goes up like the square of the length of wire.  whereas if you just add extra loops, it only goes up linearly with the length of wire.\n\ncheers!
452343
MnO4- + 5Fe2+ + 8H+ --> Mn2+ + 5Fe3+ + 4H2O
407867
b. electrons\n\nI really hope you are trying to answer these first before you put them on here because although we are all certainly willing to help you, you are not going to gain anything from just having the answers given to you.  You really need to try and learn this stuff.
261882
F = KM1M2/r^2\n\nwhere K is the constant, M1 and M2 are the magnetic moments, and r is the distance between them.
203664
the short answer is valence shell electrons.
265124
A magnet consists of molecular magnets.\nIf these magnets are arranged uniformly then the magnet will be stronger.\nIn an ordinary piece of iron there are molecular magnets, but since they are irregularly arranged there is no net magnetic field created.
18041
I'll make it easy for you.All the metals forms positive ions by losing electrons and all non-metals form negative ions by gaining electrons.\nExample:- NaCl  Na+ & Cl-
221590
Electron Spin deals with angular momentum & magnetic moments. Below is a link to an article full of information. Including what is electron spin and angular momentum as well as other important info. Enjoy.
530377
Okay, it's been a looooooong time since I had to use my chemistry skills, so lets see what I have:\n\nCopper is more magnetic with electrons than silver is because it's electrons (with fewer of them) are close to the nucleus (or whatever you call it) of the element.  Silver is more apt to lose its electrons with them being so far away.  \n\nCopper is more often found in a +2 state.  So I'd say that's a safe bet to go with.  I'd only assume a +1 state if your teacher said so.\n\nSo therefore:  2AgNO3 + Cu -> Cu(NO3)2 + 2 Ag would probably be your best bet.\n\nBut once again, it's been a long time since I used this so I don't know how right I might be.
498943
Na+ and K+ (both group 1)\nCa2+ and Mg2+ (both group 2).\nNa+ and Mg2+ have the electron arrangement of neon, and the other two that of argon.\nIonic radius decreases from left to right, and increases top to bottom, so K+ is the largest of all these.\nElectronegativity increases upwards and to the right of the Periodic Table, so Mg has the highest value of these four.
454065
Mg       2+\nPb       4+\nCrO4  2-\nNO2    1-\nI           1-\nClO3   1-\nOH      1-\nFe       2+\nNH4    1+\nCu      1+
500957
Zn(NO2)2; Co(HSO3)3; HgF; Al2(CO3)3; Cs2C2O4; Ba(ClO)2; SnBr2; Mg(HSO3)2.
394926
1) 2\n2) 4\n3)17\n4) Ar\n5) 118\n6) metallic\n7) 92U239\n8) has its valence electron farther from the nucleus\n9) americium and curium\n10) Ne0\n11) 20\n12) neutrons\n13) 1\n14) 8\n15) +2\n16) hydrogen\n17) 18\n18) 17\n19) an ion\n20) proton
50862
Three types of magnets:\n\n-Ferromagnets: Magnets which retain a magnetic field after having been magnetised in a magnetic field.\n\n-Paramagnets: Magnets that only exert a magnetic field when they're in another magnetic field.  They support the magnetic field they're in.  Usually their fields are quite weak compared to the external fields.\n\n-Dimagnets: Magnets that exert a magnetic field when they're in another magnetic field but opposing the field.  (Think: *DI*ametrically opposite).  Again, field intensity created by these magnets typically is very small compared to the external field.\n\nAdditionally, many dimagnetic and paramagnetic materials may become ferromagnetic if they are sufficiently cooled.\n\nPermanent magnets are most often ferromagnetic and will retain their magnetism for a long time even in the absense of a magnetic field.  Over time, however, thermal effects will slowly decrease field intensity, but that takes a long time for permanent magnets.
292320
a. 2k+ = .20moles , SO42-=.10moles\n\nb.Fe3+=.10moles,3NO3-= .30moles\n\nc.2Al3+=.20moles,3SO42-=.30moles\n\nd. Ni2+=.10moles,SO42-=.10moles
472148
a. N2O4\nb.PCl5\nc.NF3\nd.S2Cl2