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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
Compare the properties of electrons, protons and neutrons.
The mass of an electron is about `1/2000` times that of proton.
Which subatomic particle was discovered by : Chadwick ?
Name the subatomic particle whose relative charge is : 0
Fill in the blank of the following statement :
If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is __________.
Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur.
Name the element which does not contain any neutrons in its nucleus.
The number of neutrons present in 73Li is ______.
James Chadwick discovered the fundamental particle called proton.
The hydrogen atom does not have ______.
