Which of the following represents a rule for balancing a nuclear equation?
i. the total number of protons plus neutrons in the products and reactants must be the same
ii. the total number of each type of element in the products and reactants must be the same
iii. the total number of nuclear charges in the products and reactants must be the same
iv. the total number of each type of elementary particle in the products and reactants must be the same.

The correct answer is 1 the total number of proton plus neutrons in the products and reactants must be same.

Explanation:

During a radioactive reaction the nucleus of the radioactive atom undergo disintegration or breakdown to form new nucleus.

   Radioactive disintegration deals with the emission of α particle or β particle from a radioactive nucleus resulting in the formation of new nucleus.Although new nucleus is formed the total number of proton plus neutrons in product and reactant must be same.

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