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| Q.15 | Who discovered three chemical elements: cerium, thorium and selenium, and devised the modern method by which one or two letters are used to symbolise elements? | |
| Ans | 1. John Dalton | |
| 2. Jacob Berzelius | ||
| 3. Niels Bohr | ||
| 4. Hennig Brand |
Correct Ans Provided: 2
