Elements
2

He

Helium

Helium (He) is a colorless, odorless gas that has the atomic number 2 and the symbol He. It is a noble gas, non metal that is second most common element in the universe after Hydrogen.

Helium is most commonly used in diving, welding and for inflating balloons. Helium is often inhaled to change a persons voice, it does this as being lighter than Nitrogen and Oxygen it allows sound to travel faster so it sounds more high pitched. Helium belongs to Group 18 the Noble Gases, a non metal that is a gas. It has a melting point of -272°c and a boiling point of -268°c. Helium was discovered Pierre Janssen and Norman Lockyer who conducted work on the analysis of the spectrum of the sun. It is named after the Greek word for sun Helios. Helium is most abundantly found in the sun where it is formed from nuclear fission of Hydrogen atoms.

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FAQ's

What is the Melting Point for Helium?

Helium has a Melting Point of -272.2°F, meaning at -272.2°F it will turn to a liquid.

What is the Boiling Point for Helium?

Helium has a Boiling Point of -268.9°F, meaning at -268.9°F it will turn to a Gas.

What is the Electronegativity of Helium?

Helium's Electronegativty is 0. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Helium?

Helium has a Heat of Vaporization of 0.0845 kJ/mol.

Uses

Used in balloons, deep sea diving & welding. Also used in very low temperature research.

Sources

Found in natural gas deposits & in the air (5 parts per billion) Constantly lost to space; replenished by radioactive decay (alpha particles).

2
Protons
2
Electrons
2
Neutrons

He

Element Symbol
He
Atomic Weight
4.003
Atomic Number
2
State
Gas
Melting Point
Unknown
-272.2
°C
Boiling Point
-268.9
Unknown
°C
Heat of Vaporization
0.0845
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
0.00152
Unknown
W/cmK
Shells
2
Group
Noble Gas
Period
1
Block
S Block
Orbitals
1s2
Coefficient of Thermal Expansion
--
Covalent Radius
0.93 Å
Density at 293K
0.0001787 g/cm³
Electrical Conductivity
--
First Ionization Potential
24.5874 V
Second Ionization Potential
54.416 V
Third Ionization Potential
--
Ionic Radius
--
Oxydation States
0
Lattice Parameter
--
Lattice Parameter 2
12.8665 Å
Lattice Parameter 3
5.05 Å
Pronounced

HEE-li-em

Discovered by

Sir William Ramsey, Nils Langet, P.T.Cleve

Discovery date

1895

Orbital configuration
2

Download the Periodic Table

Explore Other Noble Gass

83.798
36

Kr

Krypton
294
118

Og

Oganesson
131.293
54

Xe

Xenon
20.18
10

Ne

Neon
39.948
18

Ar

Argon
222
86

Rn

Radon
Noble gases are seven chemical elements that make up group 18 (VIIIa) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and oganesson (Og). They are colorless, odorless, tasteless, nonflammable gases.
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