The correct electronic configuration of a chloride ion is :

The correct electronic configuration of Na^(+) is:

The correct electronic configuration of lanthanum is

The correct electronic configuration of lanthanum is

The correct electronic configuration of lanthanum is

The correct electronic configuration of nitrogen is :

The correct electronic configuration of potassium is,

The electronic configuration of chloride ion is the same as that of an argon atom. What is the difference between the two ?

the correct electronic configuration of Cu^(2+) ion is