Fill in the blanks by choosing the appropriate word/words from those given in the brackets : (Natural, synthetic, step-growth, chain-growth, natural rubber, synthetic rubber, melamine, thermo, thermosetting, addition, condensation, hydrogen bonds, van der Waals', 373-573, 543, 100, 10, benzoyl peroxide, acetyl peroxide, amide, butadiene, natrium, dimethyl terephthalate)
Elastomers are the polymers in which the polymer chains are held together by weak ........ forces.

Explanation

To solve the question, we need to fill in the blank in the statement: "Elastomers are the polymers in which the polymer chains are held together by weak ______ forces."

### Step-by-Step Solution:

1. **Understanding Elastomers**:
- Elastomers are a type of polymer that exhibit both viscosity and elasticity, which means they can stretch and return to their original shape. This rubber-like property is key to their definition.

2. **Identifying the Forces**:
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