04. Modification of Dalton's Atomic Theory
(Present Status of Dalton's Atomic Theory)
- Atoms are no longer considered as indivisible particles. Since sub-atomic particles like electron, proton, neutron etc. are present in atoms.
- Atoms of same element may not be identical in all aspects due to the presence of isotopes.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHkAPfOAEG1sIheQlQGOWiD2D36R4a1R8EvURoblmx9Iu2S24U5UtEFF00yc_5JmZEn8FmY-4biPCuoGYsbcHlWDRNnd96BZKRZE9ECynz0EucffJ0tddVK4HEaj8K39qSyJjM9mdz-boj/s1600/isotope.png)
- Atoms of different element can also have some similarities.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5fKspEskSKKbuTdGbyMx-dpqY3VLDhqezMOvH8rbi9qgR9ULobB3rXFs8FdPRDdfPj14hf-YX3SBO9jKAnZ2545DLhLG82Mh4o-6kVjpWYxqP1fANkB4iUMXRcTWhyphenhyphenI07kpMKBKbwyMrF/s1600/similarities.png)
- According to Eienston, E=MC2. This shows that mass is destructible. i.e., atoms can also be destroyed.
- Atoms of same element may not be identical in all aspects due to the presence of isotopes.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIwoMHAxlbH3G38PFaZ8XOBjIgNGipg3xJI3AlokNKsiUL2z2OS55mHRlyNZL3-W57SSJCJysqVyTPRsyziFwZoxyqvTz7MVC-C9KJJ7bVID0TM8A1NqKwOUgGwich0a1d89CFWGRLLNr1/s320/atom+one+to+atom+another.png)
- In some compounds, atoms are formed to be combined in fration.