In the universe energy, matter and go as per quantum. Energy is released in quantum of photon. Electron has a quantum mass. Proton has quantum mass. Both has a quantum charge. Neutron has a quantum mass. Speed of light is a quantum. Big bang is a quantum event essentially occurring at particular mass. It takes a quantum energy for shifting of electrons from one shell to other. In photo-luminescence light energy is released in quantum.
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I don't think there is such a law. I suspect you just mixed up several terms.
The Law of conservation of Energy applies to mass as mass is a form of energy, E=mc2.
A unit or quantum of light is called a photon. Photons are the basic units of electromagnetic radiation, have zero rest mass, and carry a discrete amount of energy that is proportional to their frequency.
There is no corresponding quantum of mass in the same way as there is for charge in quantum physics. The concept of quantized mass is not a fundamental aspect of quantum theory. Instead, mass is typically treated as a continuous variable in most physical theories.
The answer is mass. The Law of Conservation of Mass states that when a chemical or physical change takes place, you end up with the same amount of mass that you started in. It may just be in a different state, such as a gas.