Elements

• 
  Water
• 
  Fire
• 
  Air
• 
  Dirt

The four elements are what make up everything apparently.

Water is wet.

Fire is hot.

Air is cold.

Dirt is dry.

There are no other elements. No, aether is like, not even a thing, and if it was, it'd be air. Metal is just dirt and fire. Organisms like plants and animals are mostly water, plus trace amounts of the other three. Electricity is fire and air. Magnets are not included because no one knows how they work. Light doesn't have mass, and darkness is just the absence of light. Get a grip.

“	um what about Argon, Oxygen and Uranium	”
	— Silly Pete

Those are elements of the Periodic Table. Different from just elements.

“	wait so what am i	”
	— Plasma itself, somehow

You're a state of matter, which is still not an element, sorry :/

But "train" is an element in Little Alchemy, right?

Nuh uh. Trains are just dirt, fire, and air.