Ribonucleic acid ,or RNA, is one of the three major macromolecules (along with DNA and proteins) that are essential for all known forms of life. Like DNA, RNA is made up of a long chain of components called nucleotides.
The basic building block of any substance is the atom. Every element and compound is made up of one or more atoms. In making up of the atom an atom is made up of only one nucleus but can have several shells. Within the nucleus protons and neutrons are present.Every element has a specific number of protons.toms are tiny units of matter. All matter are made up of matter that occupies space and is made up of atoms. Atoms are the smallest particle of an element that can join up in whole numbers to form molecules.
the vast majority of plastics about 92 % are thermoplastics the groups of atoms that are used to make unit cells are called monomers for some plastics such as polyethylene the repeat unit can be just one carbon atom and two hydrogen atoms for other plastics such as nylons the repeat unit can involve 38 or more atoms