A lot vs. Alot: 9 Grammatical Pitfalls
Group of related chemical compounds: monosaccharide.
Binary compound: sodium chloride.
Chemical element with properties similar to another: lanthanide.
A suffix used to form the names of various chemical compounds, especially the second part of the name of a compound that has two members (such as sodium chloride) or the name of a general type of compound (such as polysaccharide).