#2. Inventions and Discoveries in Chemistry
| Inventions | Inventors | Year |
| Polythene | Eric Fawcett | 1933 |
| Osmosis | Jean Antoine Nollet | 1748 |
| Electrons | J.J. Thomson | 1897 |
| Neutrons | James Chadwick | 1932 |
| Protons | Ernest Rutherford | 1911 |
| Inert Gases | Sir William Ramsay | 1894 |
| Radioactivity | Henri Becquerel | 1896 |
| Periodic Table | Dmitri Mendeleev | 1869 |
| Oxygen | Carl Wilhelm Scheele and Joseph Priestley | 1773 & 1774 resp. |
| Hydrogen | Henry Cavendish | 1766 |
| Atoms | John Dalton | 1803 |
| Neon | Georges Claude & Paris Motor Show | 1910 |
| Acid | Albert Hofmann | 1938 |
| Ionic Bonds | Svante August Arrhenius | 1884 |
| Covalent Bonds | Gilbert Newton Lewis | 1916 |
| Aluminum | Charles Martin Hall | 1886 |
| Dynamite | Alfred Nobel | 1867 |
| pH meter | Arnold O. Beckman | 1934 |
| Polyvinyl Chloride | Waldo Semon & B. F. Goodrich Company | 1926 |
| Synthetic Rubber | Fritz Hofmann | 1909 |
| Titanium | William Kroll | 1940 |
| Radium | Marie Sklodowska- Curie and Pierre Curie | 1898 |
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