silver!
silver
Nickel is a metallic and silver-ish color, just like the US coin, the nickel (worth 5 cents).
Nickel(II) Oxide = NiO Nickel(III) Oxide= Ni2O3
Nickel(II) Oxide = NiO Nickel(III) Oxide= Ni2O3
Nickel(II) Oxide = NiO Nickel(III) Oxide= Ni2O3
Nickelous oxide. Or Nickel(II) oxide. Depends on if you're using the Stock system, or the Classical system.
Nickel leaves a silver-gray streak. Note that nickel is an element.
Nickel oxide is a solid.
By the color, obviously. NIckel plated flutes are slightly golden and well, silver plated, they have silver color.
Different color, hardness and scarcity. Both tarnish when exposed to oxygen, but silver oxide conducts electricity well, copper oxide does not.
It is silver oxide that is Ag2O.