2 2. The energy stored in a substance that can be released when the substance reacts. A. Mechanical Energy B. Thermal Energy C. Chemical Energy D. Potential Energy

C. Chemical Energy

Explanation:

The energy that stored in the substance or in compounds is called chemical energy which released when the substance reacts.

A substance is made up of atoms and molecules and chemical energy is present in those atoms or molecules. When a chemical reaction takes place, these energy released from atoms and molecules.

Chemical energy can be released in the form of  thermal energy (heat) and mechanical energy (working ability).

Hence, the correct answer is "C. Chemical Energy".

it is stable as it is in group 0 which have full outer shells of electrons