Attractive forces tend to bring two atoms close to each other whereas repulsive forces tend to move them away. In hydrogen, the magnitude of the new attractive forces is greater than that of new repulsive forces. As a result, two atoms come close to each other and potential energy decreases. The atoms approach each other until the equilibrium stage is reached where the net force of attraction balances the force of repulsion and system acquires minimum energy. 

Explanation:
Bonding between two atoms can be defined as the interaction between the valence electrons of the atoms. Two atoms are said to be bonded when the energy of the system is minimum. This is because the bonding process involves the sharing or transfer of electrons between the atoms, leading to a more stable configuration.

To understand this better, let's consider the various options given in the question -

a)System acquires minimum energy
When two atoms come close to each other, their electrons interact and the energy of the system changes. The bonding process occurs when the system reaches a minimum energy state, indicating that the atoms are in a stable configuration.

b)Potential energy becomes maximum
The potential energy of a system is the energy stored in it due to the position of its constituent particles. When two atoms come close to each other, their potential energy increases due to the repulsive forces between their electrons. Therefore, the bonding process cannot occur when the potential energy of the system is maximum.

c)Magnitude of attractive forces is greater than repulsive forces
Bonding occurs when the attractive forces between the atoms are greater than the repulsive forces. However, this is not a sufficient condition for bonding to occur. The system must also reach a minimum energy state to be in a stable configuration.

d)Energy becomes zero
The energy of a system cannot become zero, as it would violate the laws of thermodynamics. Even in a perfectly isolated system, there is always some residual energy due to the motion of its constituent particles. Therefore, this option is not correct.

In conclusion, the correct option is 'A' - Two atoms are said to be bonded when the system acquires minimum energy.

A molecule is said stable when it's energy is minimum.