if Hund's rule is not allowed then magnetic moment of Fe2+,Mn+,andCr order is?
469212
See if this helps.\n\nhttp://hyperphysics.phy-astr.gsu.edu/hbase/atomic/hund.html
224420
how far it is from the edge of the periodic table. i.e., Francium has a charge of -1 because to get it to the noble gases it has to gain an electron. on the other hand, lithium would need to lose an electron to make it happy, giving it a charge of +1. Same concept for all elements.exclude scandium's period thru zinc's, as they are very different. Carbon's group is able to go either way, as it is equidistant from the noble gases. email me if you have any more questions.
664669
Yeah, there are some special cases with some transition metals, and you're right with groups 6 and 11.  \nYou'd expect for the Cu (and the other elements in that column) to have the electron configuration [Ar]4s2 3d9.  \nInstead, the configuration is [Ar]4s1 3d10.  This configuration is more stable because the d sublevel is completely filled.  Cr's valence electron configuration (and the rest of the column's) is expected to be 4s2 3d4, but it is actually 4s1 3d5.  There is added stability in the exactly half-filled d sublevel.
771370
Mn has 25 electrons\n2, 8 , 15\nthe 15 are as 3s---2, 3p---6, rest are in 4s and 3d...(2 others)\nMn++ has thus no unpaired electron
1136539
Paramagnetic materials like Aluminum have magnetic properties, but cannot sustain a permanent dipole moment alignment. Hence it qualifies as a candidate for your question.\n\nAlso ferromagnetic materials (common ones are Cobalt, Iron, and Nickel) above their associated curie temperatures behave the same way. No permanent magnetization.
49236
ok, well, let's start with a basic description of magnetic materials.\n\nmagnetism has to do with the way electrons in a material interact with each other.  electrons have some basic properties (mass, charge, for example) and also a property called "spin".  \n\nit can be measured that any given electron has what is called a "magnetic dipole moment", which basically means that every electron behaves like a tiny bar magnet.  so the property of "spin" was devised to explain this - if you have some electric charge and move it around in a closed loop, a magnetic field is generated inside the loop.  this phenomenon is called induction and it's the basis for lots of real-life magnets.  this is why you usually see electromagnets made by wrapping wire around in a coil - when you pass an electrical current through the wire, the electrons in the metal basically move in a loop, and this causes a field to form.\n\nanyway, you can think of an electron as a little ball of electrical charge.  if the ball is spinning, then the charge on the ball is moving around in a circle - so this would create a magnetic field.  \n\nanother measurable property of this "spin" is that it is quantized - this means that the electrons can only spin at certain speeds and orientations.  different particles have different spins, and for an electron there are 2 spin states - usually referred to as "spin up" and "spin down" because the axis of the dipole moment points in different directions.\n\nthe difference between the various types of magnetic materials (ferromagnetic, antiferromagnetic, paramagnetic, etc) is in how the spins of all the electrons in the materials are oriented.\n\nin a ferromagnet, the spins are (mostly) oriented so that they're all pointing the same direction.  this causes the magnetic fields from each electron to add up, and you get a large macroscopic magnetic field as a result.\n\nin an antiferromagnet, on the other hand, spins are oriented so that neighboring electrons point in opposite directions.  this is a highly-ordered state, and in many materials only forms when you cool the substance below a critical temperature called the "neel temperature".  above this temperature the random thermal fluctuations take over and the spin ordering falls apart.\n\nantiferromagnetism is observed in transition metal compounds, in particular metal oxides, such as nickel oxide (NiO) or cobalt oxide (CoO).  the behavior of electronic spins are a subject of intense research these days, and so a simple and well-defined picture of their behavior is not easy to come by.  \n\nhowever, it is thought that the long-range interactions of electronic spin is responsible for a number of interesting effects that are being studied in transition-metal oxides.  one well-known example is in the study of high-temperature superconductors, which are often oxides of transition metal alloys.  the electrons involved in the superconducting effect act in pairs called "strongly correlated" electron pairs, and it is thought that the electrons interact via coupling through their spin.\n\nhere are some links so you can learn more:\n\nhttp://ghmfl.grenoble.cnrs.fr/magnetisme/recent5.htm\nhttp://www.jhu.edu/~gazette/2002/30sep02/30magnet.html\nhttp://www-als.lbl.gov/als/science/sci_archive/peem_spin.html\nhttp://en.wikipedia.org/wiki/Antiferromagnetism
612107
a. 2k+ = .20moles , SO42-=.10moles\n\nb.Fe3+=.10moles,3NO3-= .30moles\n\nc.2Al3+=.20moles,3SO42-=.30moles\n\nd. Ni2+=.10moles,SO42-=.10moles
995203
Ferromagnetism is the phenomenon that deals with three metals: iron, cobalt, and nickel.  These metals have unpaired electrons in their valence atomic orbitals and thus form a small magnetic field (the region that encompasses this magnetic field is called a domain).  A piece of one of these metals, however, has all of its domains oriented in several directions and thus there is very little net magnetic field.  When these metals interact with an external magnetic field, however, the domains all align in the same direction, thus causing these these metals to have magnetic properties.
702529
Name: Iron \nSymbol: Fe \nAtomic Number: 26 \nAtomic Mass: 55.845 amu \nMelting Point: 1535.0 °C (1808.15 K, 2795.0 °F) \nBoiling Point: 2750.0 °C (3023.15 K, 4982.0 °F) \nNumber of Protons/Electrons: 26 \nNumber of Neutrons: 30 \nClassification: Transition Metal \nCrystal Structure: Cubic \nDensity @ 293 K: 7.86 g/cm3 \nColor: Silvery
478897
Yes if sufficient force is applied the force of impact will negate the magnetism. This is because the charged particles (electrons, neutrons, protons) will collide and confuse the flow of energy. Unless you have an elctromagnet then the magnetism will survive.\n\nSometimes if you drop a compass you will also make it useless as they are also magnetic
581568
I think your question is wrong.\n\n_\n&#92; MR^2 = Moment of Inertia (I)\n/_\n\nwhere M is the mass of a particle, R is the distance of that particle from the axis of rotation.       \nThe sign before MR^2 means sum, indicating that the quantity MR^2 is to be computed for each particle making up the body, and the results added.
785530
Answer D.\n\nThis is the Nernst equation at standard conditions.
537198
See the listing of suppliers given in the source below.  If you want to do magnetic separation, you'll want multi-domain particles, which means using particles *larger* than about 100 nm (depending on the material).
268504
I'm not sure anyone really "know" but there are many teltail clues.  Not all materials are magnetic except perhaps under very powerful magnetic fluxes (MRI's?) but all atoms of materials do have one or more electrons orbiting their nuclii.  We know that electrons can be directed by magnetic flux, perhaps in a TV picture tube, etc.  Therefore, the number and arrangements of electrons of the atoms differ and some create magnetic properties (dipoles or two different poles).  If an iron bar is heated to a high temperature all the iron atoms in the bar are permitted to spin around willy-nilly.  If the bar is then cooled while exposed to a strong magnetic flux (electromagnet?) all its dipoles will align uniformly with the external flux like the needles of compasses aligned with the earth's flux.  When cool, the magnet exhibits the combined strength of all the dipoles that were previously working against each other.  We know that atoms repel each other because of their electrons (and even their nuclii must be forced together to fuse because of protons) like basketballs with ballbearings at their centers, where the skins are made of rapidly orbitting electrons.  Whereas the basketballs would repel each other in any given positions, actual atoms in iron crystals repel directionally and they which can attract or repel a free electron.  The magnet has collectively directed their combined force.  If each dipole has a North and South pole, we would expect the entire magnet to also have a North and South pole, and for like poles to repel, just as in the individual dipoles.  Hope that helps a little.
336860
Mag inspection utilizes the phenomenon of ' magnetic lines of force' to indicate flaws in metal castings or machinings.\n\nThis only works with pieces made of ' magnetic' material, such as Iron, steel. ( Stainless and aluminum will NOT work ). \n\nA fine powder of Iron Oxide is sprinkled liberally on the piece to be inspected.  A strong magnetic field is applied from a coil.  If a crack or void exists, the uniform lines of magnetic force will be ' distorted' around the flaw, making the Iron Oxide gather in that area.  The area can then be marked with a grease pen, and analyzed for quality control, rejected, or repaired.
790888
It lacks the crystalline electron structure that elements like magnesium and iron have. Thus, it cannot align into electrical dipoles, and is not magnetic.
91676
I answered your question already.  Magnetic field strength is governed by amount of current flow.