Question

please answer me fast if you want to to be an brainlist
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Answer 1

Answer:

I think,

1. homogeneous.

2.harmful.

3.nuclear.

4.atoms. is the answer.

Answer 2

Answer:

1) A pure substance is present in nature.

2)The composition of a pure cannot be altered by any substance means.

3)Normal elements are those elements are those which do not give two radiations.

4)An elements is a pure substance made up of any one kind of atom.