Question

5 name the following type of reactions as fusion or fission
6 which type of radioactive decay involves a helium atom?
a large nucleus → multiple smaller nuclei + neutrons fission
b multiple small nuclei → large nucleus + energy fusion
c the number of nucleons stays the same, number of nuclei increases
d the number of nucleons stays the same, total mass decreases slightly
e neutral neutron strikes a large positive nucleus

Explanation:

Fission is a process where a large nucleus splits into multiple smaller nuclei and neutrons. In fission, the number of nucleons (protons + neutrons) stays the same but the total mass decreases slightly due to mass - energy conversion. Fusion is the combination of small nuclei to form a large nucleus. Option a describes fission. Option b describes fusion. Option c and d are characteristics of fission. Option e is not a correct description related to fission or fusion in the context of the question. The question asks about radioactive decay involving a helium atom which is alpha - decay and not fission or fusion. But among the given descriptions related to fission and fusion concepts, the description of fission is in option a.

Answer:

a. Large nucleus → multiple smaller nuclei + neutrons fission