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What Are These Minerals/Vitamins Good For?

Okay Can Anyone Tell Me What The Following Vitamins Can Do For You? Like What Are The Plus's Of Taking Them In A Vitamin. What Good Are They Doing Basically?

Niacin-
Folic Acid-
Iron-
Phosphorus-
Lodine-
Magnesium-
Zinc-
Selenium-
Copper-
Manganese-
Chromium-
Molybdenum-
Chloride-
Potassium-
Boron-
Nickel-
Silicon-
Tin-
Vanadium-
Lutein-
Lycopene-

Thanks For All Of Your Help!