Chemistry is the study of how atoms(原子) combine to form materials.(化学是研究原子组合成材料 的科学) How many different types of atom: 114 so far They are listed (according to their structure and properties) in the periodic table(元素周期表)Chemistry is the study of how atoms (原子) combine to form materials. (化学是研究原子组合成材料 的科学) How many different types of atom: 114 so far. They are listed (according to their structure and properties) in the periodic table (元素周期表)