Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds.. 
A bí ní Tappahàn] Virginia, ó ṣẹkò ara rẹ̀ láti mọ orin kọ àti ijó nígbà tó wà lọ́mọdé bẹ̀ síni ó tún jẹ́ ọmọ ẹgbẹ́ akọrin Ṣọ́ọ̀ṣì.. 