The fact that it is a liquid metal is certainly not special. Bromine, though not a metal, is liquid at normal temperatures. Caesium and Gallium are both liquid at below 30 deg C, while Francium, and Rubidium become liquid below 40 deg C - a temperature that is not uncommon in many parts of the world.
Silver is widely used in industry, coinage and jewellery. It is a truly universal element.
Hydrogen is special because it is the most abundant element in the universe. It is also the simplest element, consisting of just one proton and one electron. Hydrogen is versatile and can be used as a clean energy source in fuel cells and as a potential replacement for fossil fuels.
SO is not an element. It is simply a compound.
nitrogen
Potassium
carbon is an element which is used as a standard
It's a special kekkei genkai move wherein you activate two chakra natures at the same time [in this case land and water] and produce a new chakra nature. It's special because it's hard to activate two chakra natures land and water and produce wood element [matter of fact only the First Hokage naturally mastered it].
It is the only element that can survive without electrons.
I don't think there is any special name for that.
A change in internal energy, aka "heat transfer" either in or out of the material.
Nitrogen is an element, so no other element contains nitrogen.
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