Home made bikeMy Hi-4 module went badI replaced it, and a week later, it went bad againWhen I tried to start the bike the negative battery terminal got red hotI scrubbed it with steel wool because I figured it was a corrosion issueNow the terminal doesn't get hot but my ignition doesn't workRelated or strange coincidence?
Determining Electron Configuration
What they are asking for is the predicted charge based on the electron configuration, not the current chargeBased on the configuration, we are dealing with MgWhen Mg becomes ionized (loses electrons), it tries to achieve a noble gas configurationThe easiest way for that to be achieved is by losing two valence electronsWhen the two negative electrons are lost, the atom now has a positive charge, because there are two more protons than electronsTherefore we can predict that we will end up with Mg^2+If given Al you may notice the easiest way to achieve a stable noble gas configuration, the Al will lose three electron, causing it to have a 3+ chargeFluorine is slightly differentIt is easier to gain 1 electron than to lose 7, so it comes out as 1-.
To get the anion or cation, you want to have the configuration of the nearest inert gasFor your example, if you eliminate the 3s2 elections, you get the inert gas, and a cation, +2 chargeYou eliminate the 3s2 electrons, as they are the outer shell electronsNow, for aluminum, [Ne] 3s2 3p1 If you lose three electrons, you get the inert gas, so you have a cation, +3 chargeNow take chlorine[Ne] 3s2 3p5 Now, it will be really difficult to eliminate 7 electrons, but if you gain one electron, you get the next inert gas configuration, so chlorine forms an anion, -1 charge.
for me i look at the group the element in group 1a have 1+, have 2a have 2+,3a have 3+, 4a have 4+, 5a have 3-, 6a have 2- and last 7a have 1- (1s2)(2s2)(2p6)(3s2) is Mg in group 2a so it 2+ Al is in group 3a is 3+, F is in group 7a is 1- I just remember 1+,2+,3+,4+ then 3-,2-,1- hope this help
