Matter & Energy


Matter is composed of atoms or groups of atoms called molecules. The arrangement of particles in a material depends on the physical state of the substance. In a solid, particles form a compact structure that resists flow. Particles in a liquid have more energy than those in a solid. They can flow past one another, but they remain close. Particles in a gas have the most energy. They move rapidly and are separated from one another by relatively large distances.

Alphabetic list of Chemical Elements (V-W-X-Y-Z)

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Name: Vanadium
Symbol: V
Atomic Number: 23
Atomic Weight: 50.9415
Group: Transition metals
Date Discovered: 1801
Discovered By: Andrés del Rio (disputed), or Nils Sefström 1830

Name: Xenon
Symbol: Xe
Atomic Number: 54
Atomic Weight: 131.29
Group: Noble gases
Date Discovered: 1898
Discovered By: William Ramsay and Morris Travers

Name: Ytterbium
Symbol: Yb
Atomic Number: 70
Atomic Weight: 173.04
Group: Lanthanide
Date Discovered: series 1878
Discovered By: Jean Charles de Marignac

Name: Yttrium
Symbol: Y
Atomic Number: 39
Atomic Weight: 88.906
Group: Transition metals
Date Discovered: 1794
Discovered By: Johan Gadolin

Name: Zinc
Symbol: Zn
Atomic Number: 30
Atomic Weight: 65.409
Group: Transition metals
Date Discovered: prehistoric
Discovered By: unknown

Name: Zirconium
Symbol: Zr
Atomic Number: 40
Atomic Weight: 91.224
Group: Transition metals
Date Discovered: 1789
Discovered By: Martin Klaproth