NCERT 2024-25 Class 3 English (Santoor) The Big Laddoo Chapter 7 NEP 2020 Page no. 72 Question no. 1
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Protons were thought to be located in the interior of the atom because electrons could be easily removed from atoms, whereas protons seemed to remain bound within the atom.
Scientists observed that atoms exhibited both positive and negative charges, leading them to infer the presence of positively charged protons and negatively charged electrons within atoms.
The mass of an electron is considered negligible, and its charge is minus one (-1).
The charge of a proton is represented as plus one (+1).
The mass of a proton is approximately 2000 times that of an electron.
The discovery of the proton, with a positive charge equal in magnitude but opposite in sign to that of the electron, further confirmed the existence of sub-atomic particles and provided insights into atomic structure.
The discovery of canal rays indicated the presence of positively charged particles in atoms, providing evidence for the existence of sub-atomic particles other than electrons.
Canal rays were positively charged radiations discovered by E. Goldstein in 1886 during gas discharge experiments.