Why is it that most metals are silver in colour?

Answer 1

This is the way they reflect light.

Answer 2

Metals are in the 1st and 2nd vertical columns in the Modern periodic table.They have 1 or 2 electrons in their outermost orbit. These electrons are easily excited by the energy of the visible light. Thus they can reflect visible light.

The other metals constitute the 3rd, 4th & 5th rows of the periodic table. These metals also have outermost electrons that can be excited by visible light.