Elements are pure substances made up of

Elements are pure substances comprises atoms.

An element is a substance that can't be separated into some other substance. Each element is comprised of its own kind of atom. This is the reason the chemical elements are for the most part mere different from one another.

The periodic table records all the discovered elements, gathering those with the same properties. The elements includes metals, non-metals, and metalloids. Most elements are metals, which conduct electricity and are shiny in nature. Metals incorporate iron, gold, and aluminum which are solid at room temperature.  

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.