Electronic configuration of ions
Na has the electronic configuration of 2,8,1
It's positive ion, Na+, has the electronic configuration of 2,8
Na loses an electron to another atom, therefore becomes positive.
Cl has the electronic configuration of 2,8,7
It's negative ions, Cl-, has the electronic configuration of 2,8,8
Cl gains an electron from another atom, therefore becomes negative.
Na has the electronic configuration of 2,8,1
It's positive ion, Na+, has the electronic configuration of 2,8
Na loses an electron to another atom, therefore becomes positive.
Cl has the electronic configuration of 2,8,7
It's negative ions, Cl-, has the electronic configuration of 2,8,8
Cl gains an electron from another atom, therefore becomes negative.