Answer:
Nucleus of Li atom has 3 protons and
4 neutrons. Charge on one proton \[=1.60\times {{10}^{-19}}\] coulombs
\[\therefore \] Charge on 3 protons
(i.e., charge on nucleus) \[=3\times 1.60\times {{10}^{-19}}C=4.80\times
{{10}^{-19}}C\]Mass of proton \[\approx \] mass of neutron \[\approx \,1.67\times {{10}^{-27}}\,kg\]
\[\therefore \] Mass of nucleus \[=7\times
1.67\times {{10}^{-27}}\,kg=11.69\times {{10}^{-27}}\,kg\]
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