A metal is made up of a lattice of positive ions surrounded by a ‘sea of electrons’. What happens to the electrons and positive ions in a metal wire when an electric current passes through it?
- Aelectrons: replaced by new electrons; positive ions: replaced by new ions
- Belectrons: replaced by new electrons; positive ions: unchanged
- Celectrons: unchanged; positive ions: replaced by new ions
- Delectrons: unchanged; positive ions: unchanged