Sulfur
No, SO2 and CO2 are not isoelectronic. Isoelectronic species have the same number of electrons, but SO2 has 18 electrons (6 from sulfur and 6 from each oxygen) while CO2 has 16 electrons (4 from carbon and 6 from each oxygen).
Nitrogen, oxygen, and fluorine are isoelectronic with carbon because they all have the same number of electrons (6) in their neutral state.
The Sulfide ion, S2-, is isoelectronic with Cl-
Atoms or ions that have the same number of electrons as helium (2 electrons) are considered isoelectronic with helium. Examples of species that are isoelectronic with helium include H+, Li+, Be2+, and B3+.
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).
O3 is the allotrope of oxygen that is isoelectronic.
No, SO2 and CO2 are not isoelectronic. Isoelectronic species have the same number of electrons, but SO2 has 18 electrons (6 from sulfur and 6 from each oxygen) while CO2 has 16 electrons (4 from carbon and 6 from each oxygen).
Nitrogen, oxygen, and fluorine are isoelectronic with carbon because they all have the same number of electrons (6) in their neutral state.
Neon is isoelectronic with the sodium ion.
Argon is isoelectronic with the sulfide ion.
None. The Se2- ion is isoelectronic with Krypton.
Hydroxide and water are isoelectronic with fluoride as they have the same number of electrons.
Krypton, calcium, chlorine+1 are isoelectronic with argon because they all have the same number of electrons, 18.
The noble gas that is isoelectronic with S2- is Argon. Both S2- and Argon have 18 electrons.
Atoms are isoelectronic when they have the same electron configuration. Therefore, an anion isoelectronic to krypton is bromide. A cation isoelectronic to krypton is rubidium.
The noble gas neon (Ne), is isoelectronic with N3- ion (not N atom)
Oxide ion (O2-) is isoelectronic with neon. Both species have the same number of electrons, which is 10.