The process of combining two small nuclei into one nucleus of larger mass is called

nuclear fusion

Explanation: It is a nuclear fusion because a fusion is when two join together and fission is when one thing splits into two.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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