In time-out, adam, a disruptive child who wants to stay with his class, is removed from the classroom. this exemplifies:

This Exemplifies: Omission training - reward is taken away from the learner

Omission training is a behavioral method used primarily for young children, in order to ensure they understand how positive reinforcement will be removed if they behave in an unwanted manner. 

Instead of physical or verbal abuse, the method is used to punish a kid by simply removing the subject of their enjoyment.
It is also called  ''negative punishment''.

Alloy of metals is the answer