Write the functions of following: 

 i) Selenium 

 ii) Chromium 

iii) Manganese

Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard, and brittle transition metal.[4] Chromium is the main additive in stainless steel, to which it adds anti-corrosive properties. Chromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing. Polished chromium reflects almost 70% of the visible spectrum, and almost 90% of infrared light.[5] The name of the element is derived from the Greek word χρῶμα, chrōma, meaning color,[6] because many chromium compounds are intensely colored.Selenium is an essential trace mineral that supports many bodily processes. It can help improve cognition, immune system _______ ___ _____ ______ _________ ______ ___ ____.
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