Po --> Polonium (gains 2 electrons to complete octet rule)
Ra --> Radium (loses 2 electrons to complete octet rule)
Both end up with 86 electrons, the same amount that Rn (Radon) has.
The ion that is isoelectric with Rn (radon) is the noble gas ion Kr+ (krypton ion). Both Rn and Kr+ have the same electron configuration, with 36 electrons.
iron
The charge of a sulfide ion that is isoelectric with its nearest noble gas (argon) is -2. This means that the sulfide ion has gained two electrons in order to have the same electron configuration as the noble gas.
by isoelectric focusing appratus
Probably you want the electron cofiguration of uranium: [Rn]5f36d17s2 The ion U4+ lost four electrons.
Electron configuration of radium:Ra: [Rn]7s2Ra(2+): 1s2.2s2.2p6.3s2.3p6.3d10.4s2.4p6.4d1o.4f14.5s2.5p6.5d10.6s2.6p6.
Bromide ion is isoelectronic with Krypton.
iron
The charge of a sulfide ion that is isoelectric with its nearest noble gas (argon) is -2. This means that the sulfide ion has gained two electrons in order to have the same electron configuration as the noble gas.
An isoelectric line on the electrocardiograph is the base line on an electrocardiogram.
by isoelectric focusing appratus
The question is somewhat flawed. Isoelectric means when two different atoms possess the same electron configuration - i.e. one has to be an ion. As an arbitrary example, H- and He would both be 1s2, and isoelectric. Sulfur and oxygen are not isoelectric, sulfur has a whole extra shell of electrons. If you simply mean, is SO2 a charge molecule? Then no, there is no nett charge on SO2. It is, however, a polar molecule, due to being bent (similar to water).
These are the noble gases: He, Ne, Ar, Kr, Xe, Rn.
Probably you want the electron cofiguration of uranium: [Rn]5f36d17s2 The ion U4+ lost four electrons.
Oxygen
Electron configuration of radium:Ra: [Rn]7s2Ra(2+): 1s2.2s2.2p6.3s2.3p6.3d10.4s2.4p6.4d1o.4f14.5s2.5p6.5d10.6s2.6p6.
The only elements that form an ion isoelectric with krypton are the elements in Period 4 and Columns 15 through 17 of a wide form periodic table and the elements in Period 5 and Columns 1 and 2 of a wide form periodic table. All other elements do not form such an ion.
4.5 to 5.5 . its acidic.