Rust isn't an element at all and is fact a chemical compound. Rust is formed by two elements: Oxygen (O) and Iron (Fe). Rust's chemical name is Iron Oxide, which can be expressed as a formula like so;
FeO
Iron is the transition metal that rusts when exposed to oxygen, forming iron oxide.
Iron rusts first because it is more reactive than copper. When iron comes into contact with oxygen and water, a chemical reaction occurs that forms rust, whereas copper does not rust easily due to its lower reactivity.
When a part rusts, it typically becomes heavier in weight because rust is formed when iron reacts with oxygen in the presence of moisture, adding weight to the original material.
The oxygen that rusts iron comes from the air. When iron is exposed to oxygen and moisture in the air, a chemical reaction occurs that forms iron oxide, known as rust.
Iron atoms are not destroyed when iron rusts; they undergo a chemical reaction called oxidation, forming iron oxide (rust). The atoms are rearranged to create a new compound, but the iron atoms still exist within the rust.
Iron
All active metals below Hydrogen in the galvanic series.
Iron is the industrially important element that contains 26 electrons and rusts in the presence of air and moisture.
The plural of rust is rusts. As in "a nail left in the open rusts easily".
Iron is the transition metal that rusts when exposed to oxygen, forming iron oxide.
rusts and smuts
pure iron rusts too rapidly and crumbles, however many iron alloys can be very durable. Iron is a pretty cool element, though, still.
iron
no it a physical
it rusts
Wheat rusts "eat" wheat. It's a type of fungus that grows parasitically on wheat and related plants.
Metal rust will not harm trees. There are a number of fungus rusts that can harm plants but they are not metal rusts.