HELIUM

ATOMIC FACTS

• Atomic symbol: He
• Atomic number: 2
• Atomic mass: 4.0

MADE BY:

• Maria Guzman
• Kassandra Castillo
• Victor Gonzalez
• Jorge Ramos

FACTS ABOUT HELIUM

• Electron configuration: 1s2
• Melting point:-272.0*C
• Boiling point: -268.6*C
• Color: colorless
• Isotopes: He-3 - Stable . He-4 - Stable

NUMBER OF...

• Number of neutrons: 2
• Number of protons: 2
• Number of electrons: 2

Atomic structure (Bohr model)

DISCOVERY INFO

• Discoverer: Sir William Ramsay
• Date of Discovery: 1895

OTHER INTERESTING FACTS

• Name of Origin: From the Greek word Helios (sun)
• Crystal Structure: Hexagonal
• Classification: Noble Gas
• Density: @ 293 k: 0.1785 g/cm3
• Number of Energy Levels: 1
• First energy level: 2

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