Question

discovery of neutron

Answer 1

an atom is electrically neutral as it contains an equal number of proton and electron but the mass of all the proton and electron do not account for the mass of an atom Rutherford in 1920 therefore suggest the presence of a neutral particle in the nucleus of an atom having a proximity same mass of that throat or Rutherford predicted was proved to be true in 1932 by James chadwick he discovered that when the beryllium Boron is Bmbaeded by Alpha particles are highly penetrating radiation is emitted it actually consist of new particles which carry known electrical charge and have mass nearly equal to that of proton these particle work all neutron

Answer 2

Neutron is a subatomic neutral particle...means which is neither positively charged or negatively charged...

It is found as we know that the mass of the positively charged particle ( Proton )
$1.67 \: \times {10}^{ - 27} kg$
It is mass of one proton...during bombarding of Alpha particles which are nothing just a helium nucleous or A particles having positive charge of 2 unit...

So if Alpha particle have 2 unit of positive charge then its mass must be equal to the double the mass of proton...But Experimentally it is observed mass of alpha particle is 4 times the mass of a proton...

This mean there must be another particle inside the nucleous which is unknown to us and such particle definitely do not have any charge i.e, neutral...This is firstly observed by the JAMES CHADWICK...

The whatever particle we found we put suffix as ON...and name this particles as Neutron...

Neutron first discovered by James Chadwick....Neutron is that particle which actually hold the positively charged particles inside the nucleous...and it is little heavier than proton...