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We present a FUSE spectroscopic study of the nearby gas--rich,metal--deficient blue compact dwarf (BCD) galaxy IZw 36. Atomic hydrogen andmany metal lines are observed in absorption against the stellar continuum ofyoung, massive stars embedded in the ionized region. Profile fitting ofabsorption lines allowed us to determine abundances and investigate thechemical composition of the neutral gas. This study present strong evidencesthat nitrogen is 16 (+7 -8) times less abundant in the neutral gas with respectto the ionized gas (all uncertainties are 2 sigma. Similarly, the oxygenabundance estimated using phosphorus as a tracer is lower in the neutral gas bya factor 8 (+17 -5). We also find that argon is underabundant by a factor 32(+8 -7) and that log (ArI/OI) < -3.0 which is inconsistent with the solar value-2.1 (+0.1 -0.1) (Lodders2003), implying that argon is likely ionized into ArIIin the neutral medium.Comment: Accepted by A&

Abundance differences between the neutral and the ionized gas of the dwarf galaxy IZw 36