It has been proved that, during a chemical reaction,

It has been proved that, during a chemical reaction, atoms are neither created nor destroyed. This law is also known as the:
यह सिद्ध हो चुका है कि रासायनिक अभिक्रिया के दौरान परमाणु न तो बनते  है और न ही नष्ट होते हैं। इस नियम को ________ के रूप में भी जाना जाता है।

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