You wouldn't expect strontium to gain electrons in a chemical change.
5s orbital-ssmith ;))
Cu(2-) does not exist, because Cu does not gain electrons at all being a metal. When it gives off two electrons Cu(2+) ions are formed.
4
A Battery.
Chlorine gain electrons.
Iron(II) indicates that the cation is Fe2+. The (II) indicates the oxidation number of iron in this case it has lost 2 electrons. ( OILRIG -oxidation is loss (of electrons), reduction is gain).
it has gain 4 electrons
Reduction Is Gain of electrons
Gaining electrons lead to decrease in oxidation state.
two are lost
it will lose 3 electrons
Gain or lose
There is zero NET loss or gain of electrons
Xe neither gain or lose electrons= 0
Iron reacts with oxygen to form Fe2O3 also known as rust. Oxygen requires two electrons to fill it's valence shell so iron loses electrons.
Lost because it is easier for the element to lose 3 electrons and become an octet than it is to gain 5 electrons.