8 because sulfur has 6 valence electrons and when it becomes sulfide it gains two electrons making it 6+2=8.
Sulfur is generally considered to have six valence electrons in each atom.
The sulfide ion is S^2-, so it has 2 additional valence electrons compared to neutral sulfur. Neutral sulfur has 6 valence electrons, so sulfide ion would have 8 valence electrons.
6
-1
[Ne]3s^23p^6
There are 7 valence electrons in chlorine atom and 8 valence electrons in chloride ion.
A chloride ion has 18 electrons, giving it a valence of -1.
Iodine atom has 7 valence electrons, whereas Iodide ion has 8 valence electrons.
Three electrons
Phosphorus forms P3- ion and it has 8 valence electrons (5 valence electrons from phosphorus and three from the charge).
There are 7 valence electrons in chlorine atom and 8 valence electrons in chloride ion.
A chloride ion has 18 electrons, giving it a valence of -1.
Iodine atom has 7 valence electrons, whereas Iodide ion has 8 valence electrons.
Three electrons
Chlorine has 7 valence electrons. A chloride ion has 8.
A magnesium atom has 2 electrons in its valence shell. A magnesium ion has 8 electrons in its valence shell.
Phosphorus forms P3- ion and it has 8 valence electrons (5 valence electrons from phosphorus and three from the charge).
8
Helium has two valence electrons. O6+ ion (a hypothetical ion) will also have 2 valence electrons.
Halides have 7 valence electrons, but the halide ion, haven gained an electron has 8 valence electrons
Electrons in the outermost shell of an atom/ion are called valence electrons
The hydrogen ion H+ is without electrons.