The current version of The Powder Toy contains 13 categories of elements.

Walls

Conductive Wall

E-Wall

Detector

Streamline

Fan

Liquid Wall

Absorb Wall

Wall

Air Wall

Powder Wall

Conductor

E-Hole

Gas Wall

Gravity Wall

Energy Wall

AirBlock Wall

Electronics

Duplicator Ray

Tungsten

Particle Ray Emitter

WireWorld Wires

Mercury

Electromagnetic Pulse

Ray Emitter

Wireless Transmitter

Instant Wire

Tesla Coil

Insulated Wire

Switch

Battery

Electrode

Positive Temperature Coefficient Thermistor

Negative Temperature Coefficient Thermistor

Insulator

N-Type Silicon

P-Type Silicon

Spark

Metal

Sensors

Invisible

Detector

Temperature Sensor

Pressure Sensor

Force

Pipe

Accelerator

Decelerator

Force Emitter

Repel*

Damage*

Piston

Frame

Explosives

Fire

Gunpowder

Nitroglycerine

C-4

Rubidium

Liquid Rubidium

Lightning

Thermite

Sub-Zero Flame

Fireworks

Lightning

More Destructive Bomb

Original Fireworks

Bomb

Cold Explosive

Trinitrotoluene (TNT)

Ignition Cord

Gravity Bomb

Gasses

1. Smoke (SMKE)
2. Noble Gas (NBLE)
3. Plasma (PLSM)
4. Steam (WTVR)
5. Gas

Liquids:

1. Liquid Nitrogen (LN2)
2. Liquid Wax (MWAX)
3. Salt water (SLTW)
4. Distilled water (DSTW)
5. Acid
6. Lava
7. Oil
8. Water (WATR)

Powders:

1. Broken glass (BGLA)
2. Sand
3. Broken Metal (BRMT)
4. Salt
5. Concrete
6. Snow
7. Stone
8. Dust

Solids:

Radioactive:

1. Uranium (URAN)
2. Plutonium (PLUT)
3. Neutrons (NEUT)

Special:

1. Fighter (FIGH)
2. White hole (WHOL)
3. Black hole (BHOL)
4. Tron (TRON)
5. Stickman 2 (STK2)
6. Portal Out (PRTO)

PRTI BCLN CONV STKM VENT VACU DMND VOID CLNE