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प्रश्न
Explain in brief the experimental proof which led to the discovery of –
Neutrons
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उत्तर
Discovery of Neutrons: As atom contains protons and electrons. The atomic mass of the electron is negligible.
∴ An atom of helium which contains 2 protons should have a mass = (2 × 1) + 0 = 2 a.m.u. But the atomic mass of a helium atom was found to be approximately 4.0 a.m.u. It was, therefore, proved that, in the nucleus of an atom, there is another particle called a neutron which has no electrical charge but is almost of an equal mass as the protons.
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संबंधित प्रश्न
Name the three sub-atomic particles of an atom.
A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
The mass of an electron is about `1/2000` times that of proton.
Which subatomic particle was discovered by : Chadwick ?
Fill in the blank of the following statement :
The subatomic particle not present in a hydrogen atom is ________
Write down the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.
Calculate the number of neutrons, protons and electrons:
- atomic number 3 and mass number 7
- atomic number 92 and mass number 238.
On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
Beryllium + α – rays → Carbon + ______.
The ratio of neutrons in C and Si with respective atomic masses 12 and 28 is ______.
