Write a brief note on protons.

$\bullet$ Protons are present inside the nucleus of an atom.
$\bullet$ Protons are positively charged i.e. $1.6\times {10}^{-}19$ $Coulomb$.
$\bullet$ The mass of a proton is approximately 1u (1Dalton)
i.e. $1u=1.66\times {10}^{-}27$ $g$.
$\bullet$ They are bound in the nucleus closely.