By using silver paint!
chrome
Silver.
Fuschia
gold
probably a light green-silver
black and blue and silver
Platinum or gainsboro.
None. Because matter of factuality, silver is not a color and so is gold. They're metals.
Black
A mix of black and white. Make sure it is metallic paint or you will just have grey!
Use the black and white color pencils.
To form a dull version of silver you combine gray and white. If you want the exact color of silver you can always just go buy anything in that color.