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Match the following:
$A$. Chadwick$1$. Cathode rays
$B$. Rutherford$2$. $X$-ray spectra
$C$. Moseley$3$. Discovery of neutrons
$D$. $J$. $J$. Thomson$4$. Nuclear atom model

$A$ certain particle carries $2.5 \times 10^{-16} \, C$ of static electric charge. Calculate the number of electrons present in it.

The ratio of specific charge of a proton to that of an $\alpha -$particle is:

Who discovered the charge of an electron? State the charge and mass of an electron.

The radius of the nucleus is related to the mass number $A$ by

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