Advertisements
Advertisements
प्रश्न
Explain in brief the experimental proof which led to the discovery of –
Neutrons
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
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 __________.
Fill in the blank of the following statement :
The subatomic particle not present in a hydrogen atom is ________
On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
Calculate the number of neutrons present in the nucleus of an element X which is represented as `""_15^31"X"`
Isotopes exist because atoms of the same element can have different numbers of ______.
What is the charge of a neutron?
Which subatomic particles have no charge?
Beryllium + α – rays → Carbon + ______.
The ratio of neutrons in C and Si with respective atomic masses 12 and 28 is ______.
