Basic Information about helium

Name: Helium
Symbol: He
Atomic Number: 2
Atomic Mass: 4.002602 amu
Melting Point: -272.0 °C (1.15 K, -457.6 °F)
Boiling Point: -268.6 °C (4.549994 K, -451.48 °F)
Number of Protons/Electrons: 2
Number of Neutrons: 2
Classification: Noble Gas
Crystal Structure: Hexagonal
Density @ 293 K: 0.1785 g/cm3
Color: colorless

 

Atomic Structure

[Bohr Model of Helium]   Number of Energy Levels: 1
First Energy Level:

    2

 

Isotopes

Isotope Half Life
He-3 Stable
He-4 Stable

 

Facts


Date of Discovery: 1895
Discoverer: Sir William Ramsay
Name Origin: From the Greek word hêlios (sun)
Uses: balloons, deep sea diving
Obtained From: natural gas deposit, air

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