Cl2. V kr.  What has higher boiling point    I have looked up chlorine at -34 , Cl2, and krypton at -153 c.   Correct me if I'm wrong but that means chloride has a higher boiling point and is less negative   They both are ruled by intermolecular forces, london force  and it would appear to me that krypton has higher london so should have higher bp

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Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.