Tarnish
This metal is iron.
With the exception of iron , no metals rust. Rust is the oxide of iron. However, most metals do form oxides. Notably Gold and Platinum do not readily form oxides.
It depends on what you mean by "heavier." Rust is less dense than iron. However, if you allow 1 gram of iron to rust completely, you will have more than 1 gram of rust. if we have equal volume of pure iron and rust (ferric oxide) then rust is lighter than iron.
There is 1 Iron atom and 2 oxogen atoms in Iron rust.
Iron rusts when it reacts with oxygen in the presence of water to form iron oxide. The compound needed for iron to rust is iron oxide, which is commonly known as rust.
Tarnish
The "rust" of silver is tarnish. If you want to get technical, only iron truly rusts.
Silver (coins) do NOT rust. Rust the iron when oxidised. Silver will oxidise very slowly, to form silver oxide, which is black in colour, This oxidation process can take weeks/months to occur. If you have any silverware, you will normally polish it once a week. this prevents oxidiation. However, if you leave it unpolished for say , 6 months, the silver will appear dull or black in places; this is silver oxide.
Iron itself is a silver-gray metal. The color that iron exhibits is primarily due to oxidation, forming a reddish-brown rust when exposed to the elements. So, the colors associated with iron are usually shades of gray, silver, and rust.
steel - due to the presence of iron in it. others will oxidise, not rust.
No they will not get rust they are not iron to get rust. only iron get rust.
This metal is iron.
All coins, even gold and silver, will tarnish, but rust is iron oxide, so only coins with iron in them will rust. The only ones I can think of are the steel 1943 US cents and some European Coins from the WW2 era.
Iron does rust by reacting with oxygen.
Liquids do not rust, iron does, rust is Hydrated Iron (III) oxide, so the only substance which can rust iron is water
Rust is an iron oxide, Fe2O3.
Silver does not rust but fading of silver when left to environment is called as Tarnishing Rust is the name given to the oxydisation of iron or any alloy containing it, like steel. All metals oxydise including silver, but we generally call oxydisation of silver, tarnish.