What happens to the current when a wire is left open to air at one end? I know that current is produced due to potential difference which makes the free valence electrons being passed on in a copper wire(or am i wrong, plz crt me if so). Each copper atom provides a single free electron.
When a voltage is connected across a piece of copper, it pushes the free electrons so that they flow through the metal – that's an electric current.
But what happens to it when one end of the wire is left open (in air not touching ground). what happens to the free voltage or free electron ?? It stays der ? How ?
 A: Since the final state might well be that no charges are moving you could treat it as a question about electrostatics.  
You have an uncharged wire and as you bring it close to the negative terminal of a battery (surplus of electrons here) then charges are induced on the wire by the free electrons in the wire mooing away from the negative terminal leaving a surplus of electrons at the other end of the wire.
This movement of the free electrons continues until the electric field inside the wire is zero and one end of the wire is connected to the negative terminal of the battery.   
The air around the wire could become a conductor if the air is ionised accompanied by the production of mobile electrons.
The ionisation of the air can be achieved by having a radioactive source close by, by heating the air or by having a fairly large electric field around the end of the wire which then ionise the air via an avalanche process.  
The free electrons in solid and liquid metals are there because it is energetically favourable for a lattice of positive ions to form with the liberated electrons being able to wander throughout the metal.
This is the essence of a metallic bond.  
However the electrons are confined within the metal as it requires energy to remove them electron from the solid.
The photoelectric effect, thermionic emission and field emission are all examples of electrons being given enough energy to escape from the metal.
A: Electrons are not free to move. The system is governed by force in an electric field, and the system is either endothermic or exothermic due to attraction and repulsion. Systems are usually operated in exothermic states with a load dominating direction of attraction.  The circuit must be closed to move electricity or otherwise you have an electrostatic field or open voltage.
A: There can be no current in a wire with one end open to air.  You need a completed circuit (a path to the source or ground) Technically electricity can travel through air you just need 3 million volts plus otherwise known as lightening.
To rephrase your question what is going on with all the electric outlet's in our home?  Why doesn't electricity just shoot out?  There is no electricity in the wire going to your outlet until you plug something in to complete the circuit.  In other words electricity (EMF) not to be confused with electrons which by the way do not flow (they wiggle back and forth/ save DC).  The Electricity in your outlet is at the power plant.  When you plug something in, then, and only then, will it travel to your home's outlet and appliance.  How can that be?  It moves at the speed of light essentially.
