Question

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what is mass number and how to find the number of neutrons if the number of protons and mass number are given?

what do you mean by the law of conservation of mass ?​

Answer 1

Answer:

The small contribution of mass from electrons is disregarded in calculating the mass number. This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu.

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions