What is the difference between fusion and fission?

Question

In terms of energy released, energy required, reactants, and products.

Answer 1

Fusion  mean smash together , Fission mean Break apart or divide

Answer 2

Fission:

1) A nucleus breaks down into 2 smaller parts and produces large amount of energy, generally 200eV per fission.

2) A slow moving neutron will be required for fission.

3) Reactants are generally unstable nuclei(U-235,Pu-239) which absorb the neutron and split up.

4) Products are stable nuclei and one or more neutrons.

Fusion:

1) Multiple neutrons join to form a bigger neutron releasing energy around 4Mev.

2) Energy is required(around 0.01Mev) to overcome energy barrier and to fuse two nucleus.

3) Reactants are light nucleus such as H,He.

4) Products formed are the heavy nucleus(such as He,C) and a free neutron.

Fusion releases much,much more energy per unit weight of fuel than the Fission reaction. But fusion cannot be controlled,  while fission can be(as in nuclear reactors). Although fusion requires energy initially, but it releases huge amounts of energy.