Explain what the term 'allotropes' mean​

Explanation:

The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state. Allotropes may show differences in chemical and physical properties. Swedish chemist Jons Jakob Berzelius proposed the concept of allotropy in 1841. The word “allotropy” comes from the Greek word allotropia, which means changeableness.

1. they vary with a higher number because boiling is way hotter than melting