Hund's Rule
Phosphorus has three unpaired electrons in its ground state.
An atom of antimony in its ground state has 3 unpaired electrons.
There are 5 unpaired electrons in Fe^3+ in its ground state.
3 electrons. This can be told from the periodic table. These electrons are in the 2p orbital.
Iodine has one unpaired electron in its ground state.
There are 5 unpaired electrons in Fe^3+ in its ground state.
Magnesium has five unpaired electrons and is therefor paramagnetic
There are 0 unpaired electrons which would make it diamagnetic
There are three unpaired electrons in an atom of cobalt in its ground state. This can be determined by the electron configuration of cobalt, which is [Ar] 4s2 3d7. The 3d orbital has 5 electrons, so there are 3 unpaired electrons.
Noble gases, like helium, neon, and argon, have no unpaired electrons in their ground state electron configuration. This means that all of their electrons are paired up in orbitals.
That would be 0. The ground state of every element except for Hydrogen is 1s2 which has no unpaired electrons. (only valence electrons have the ability to be unpaired). Full configuation of Fe would be: 1s2 2s2 2p6 3s2 3p6 4s2 3d6 WWWWWWWWWRRRRRRROOOOOOONNNNNNGGGGGGG!!!!!!!
To deduce the number of unpaired electrons in the ground state configuration of an atom, you can follow Hund's Rule. Fill up the orbitals with electrons, pairing them up first before placing them in separate orbitals. The unpaired electrons are those that remain in separate orbitals after all orbitals are filled with paired electrons. Count these unpaired electrons to determine the total.