begin{table}[tp]%
centering%
begin{tabular}{cccccc}
toprule%
&Table &Light [L]  &$zeta_0/2pi$ [MHz]  &Flux [1/s]  &Dimensions [m] \toprule
&10    &3          &28.73                 &asd         &$(20times 10)$ \
&1     &3          &28.73                 &asd         &$(20times 10)$ \
&0     &3          &28.73                 &asd         &$(20times 10)$ \bottomrule
end{tabular}
caption{Maximum load and nominal tension.}
label{aggiungi}
end{table}

listfiles
documentclass{article}
usepackage{caption,array,booktabs}
begin{document}

begin{table}
caption{Maximum load and nominal tension.}label{aggiungi}
centering
begin{tabular}{@{}cccc>{$}c<{$}@{}}toprule
Table &Light  &$zeta_0/2pi$ &Flux   &mbox{Dimensions}  \
      &[L]    & [MHz]         &[1/s]  &mbox{[m]} \midrule
10    &3      &28.73          &asd    &(20times 10) \
1     &3      &28.73          &asd    &(20times 10) \
0     &3      &28.73          &asd    &(20times 10) \bottomrule
end{tabular}
end{table}

end{document}

documentclass{article}
usepackage{booktabs,siunitx}
begin{document}
begin{table}
centering
begin{tabular}{ccS[table-format=2.2]cc}
toprule
Table & Light    & {$zeta_0/2pi$} & Flux          & Dimensions     \
      & (si{L}) & {(si{MHz})}     & (si{s^{-1}}) & (si{m})       \
midrule
10    & 3        & 28.73            & asd           &$(20times 10)$ \
1     & 3        & 28.73            & asd           &$(20times 10)$ \
0     & 3        & 28.73            & asd           &$(20times 10)$ \
bottomrule
end{tabular}
caption{Maximum load and nominal tension.}
label{aggiungi}
end{table}
end{document}