Explain how the meanings of the following terms differ.
nuclear fission and nuclear fusion

Explanation

To explain the differences between nuclear fission and nuclear fusion, we can break down the concepts step by step:

### Step 1: Define Nuclear Fission
Nuclear fission is a process where a large atomic nucleus splits into two or more smaller nuclei. This process typically involves heavy elements, such as uranium or plutonium.

**Example:**
When a uranium-235 nucleus absorbs a neutron, it becomes unstable and splits into smaller nuclei, such as barium and krypton, along with the release of energy and additional neutrons.

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