ICSE Class 9 Chemistry
Question 24 of 39
Atomic Structure and Chemical Bonding — Question 36
Back to all questionsContradictions with Modern atomic theory:
| Dalton's atomic theory | Modern atomic theory |
|---|---|
| Atoms are indivisible particles. | Atoms are divisible into sub-atomic particles like protons, electrons and neutrons. |
| Atoms can neither be created nor be destroyed. | Atoms can be created and destroyed by nuclear fusion and fission. |
| The atoms of an element are alike in all respects, but they differ from the atoms of other atoms. | The atoms of an element may not be alike in all respects, as seen in the case of isotopes. |
| Atoms of elements combine in small whole numbers to form molecules. | In the formation of organic compounds, the numbers can be very big such as thousands. |
Correlation with Modern atomic theory:
The modern atomic theory however correlates with Dalton's atomic theory in the fact that atoms are the smallest unit of matter taking part in a chemical reaction and in a given compound the relative number and kind of atoms is a constant.