When a nucleus emits a beta particle, the mass number of the nucleus
same.
One of the fundamental laws of chemistry is mass conservation. The mass of the products entering the reaction and the mass of the products emerging from the reaction are both the same every time a reaction takes place. Mass is a unit used to describe how much matter is present in an object. Usually, the unit of mass is either kilograms (kg) or grams (g) (kg). Mass is a measure of how much matter there is, regardless of where it is in the universe or how much gravitational force is being applied to it. An object's mass is constant regardless of the circumstance, in contrast to an object's weight, which is a force that depends on gravity. Your mass is the same on Earth and the Moon.
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