How do you light the oven? We turn the dial and

I take it the range is electric ignition because you say the top burners have a clicking(igniter) noise. If the top burners are electric ignition then the oven is also. The oven probably uses a hot surface igniter and that is why you do not hear any clicking. Turn the oven on and open the broiler compartment. You should see a bright glow from the hot surface igniter. If you do not see any glow there may be a grounding issue or the igniter could be bad. If you do see a glow but the burner does not come on in a few minutes then give the gas valve a tap with a wrench and see if the burner comes on. Shut it off and then back on several times. If the burner continues to light after this you may have fixed the problem. If it does not come on gas valve could be sticking or igniter is weak.