Question

-----100 points-------
The atoms or molecules of a solid are always arranged in a regular pattern do you agree give reasons??

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Answer 1

Yes, the atoms in a molecule are always arranged in a regular pattern . If their pattern is changed then the same molecule is impossible to be made. So, even if one single atom is added or if there is a change in the composition ( arrangement of the atoms ) of the molecule we may get another element or compound. Thus, the arrangement of atoms in a molecule is very important but if changed then the substance to be formed also changes. 
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Answer 2

No not always only in case of crystalline solid with long range ordered structure without any defects have regular pattern.