Fill in the following table $($each column represents a different isotope$)$:

a$.$

b$.$

c$.$

$\backslash$table$[[$Complete Chemical Symbol,${?}^{55}Cr,,],[$Element Name $($specific isotope$),,,54],[$Atomic Number,,,$],[$Mass Number,,$58,],[$Number of Protons,,$74,],[$Number of Neutrons,,,$],[\backslash$table$[[$Number of Electrons $($free$],[$atom$)]],($skip for ${?}^{55}Cr),,],[$Number of Valence Electrons,,,$],[$Group Number,,,$],[$Group Name $($if there is one$),,,],[$Period$,,,],[$Metal$/$nonmetal$?,,,]]$