1. + + -
If it loses an electron the atom now has one too many protons in the nucleus.
The atom now has a positive charge and is called an ION.
This happens in solid metals! - -
A normal single metal atom has the same numbers of protons (in the nucleus) as electrons in orbit.
The atom is NEUTRAL

2. The free electrons can move!! + - + - + - + -
The free electrons can move!!
In a metal electrons are the only carriers of electricity
In a solid piece of metal
POSITIVE IONS are in a FIXED LATTICE.
The cannot move in bulk!!!