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We present spatially resolved ($\sim$50 pc) imaging of molecular gas speciesin the central kiloparsec of the nearby starburst galaxy NGC 253, based onobservations taken with the Atacama Large Millimeter/submillimeter Array(ALMA). A total of 50 molecular lines are detected over a 13 GHz bandwidthimaged in the 3 mm band. Unambiguous identifications are assigned for 27 lines.Based on the measured high CO/C$^{17}$O isotopic line ratio ($\gtrsim$350), weshow that $^{12}$CO(1-0) has moderate optical depths. A comparison of the HCNand HCO$^{+}$ with their $^{13}$C-substituted isotopologues shows that theHCN(1-0) and HCO$^{+}$(1-0) lines have optical depths at least comparable toCO(1-0). H$^{13}$CN/H$^{13}$CO$^{+}$ (and H$^{13}$CN/HN$^{13}$C) line ratiosprovide tighter constraints on dense gas properties in this starburst. SiO haselevated abundances across the nucleus. HNCO has the most distinctivemorphology of all the bright lines, with its global luminosity dominated by theouter parts of the central region. The dramatic variation seen in the HNCO/SiOline ratio suggests that some of the chemical signatures of shocked gas arebeing erased in the presence of dominating central radiation fields (traced byC$_{2}$H and CN). High density molecular gas tracers (including HCN, HCO$^+$,and CN) are detected at the base of the molecular outflow. We also detecthydrogen $\beta$ recombination lines that, like their $\alpha$ counterparts,show compact, centrally peaked morphologies, distinct from the molecular gastracers. A number of sulfur based species are mapped (CS, SO, NS, C$_{2}$S,H$_{2}$CS and CH$_{3}$SH) and have morphologies similar to SiO.

ALMA Multi-line Imaging of the Nearby Starburst Galaxy NGC 253