Pt | Hydrogen

Basic Information

Name

Hydrogen

Atomic Number

Gas Phase

Diatomic

Allotropes

Dihydrogen

Appearance

Colorless gas

Refractive Index

1.000132

Phase At STP

Gas

Spectrum Image

Source

Wikipedia

Bohr Model

Static

Interactive

Descriptive Numbers

CAS Number

1333-74-0

CID Number

CID783

DOT Number

1966

RTECS Number

RTECSMW8900000

Mendeleev Number

105

Pettifor Number

103

Space Group Number

194

Glawe Number

103

Mass

Atomic Mass

1.008 Da

Periodic Position

X Position

Y Position

Period

Group

Classification

Block

Abundance

Urban Soil

15 mg/kg

Seawater

0.11 kg/L

Sun

28,000 mole ratio to silicon

Earth Crust

0.0014 g

Human Body

10 %

Solar System

28,000 mole ratio to silicon

Meteorites

2.4 %

Color

Jmol

#FFFFFF

Molcas Gv

#FFFFFF

CPK

#FFFFFF

Atomic Radius

Empirical

Calculated

Van Der Waals

120

Bonding

120

Room Temperature

110

Rahm

154

Dreiding

319.5

Uff

288.6

Mm3

162

Alvarez

120

Covalent (Single Bound)

Covalent (Cordero)

Covalent (Pyykko)

C12

Temperature

Melting/Freeze (USE)

13.99 °K

Melting/Freeze (WEL)

14.01 °K

Melting/Freeze (CRC)

13.84 °K

Melting/Freeze (LNG)

13.65 °K

Boiling/Density (USE)

20.271 °K

Boiling/Density (WEL)

20.28 °K

Boiling/Density (CRC)

20.121 °K

Boiling/Density (LNG)

20.12 °K

Boiling/Density (Zhang)

21 °K

Critical Temperature

32.97 °K

Flashpoint

255 °K

Autoignition Point

808.5 °K

Critical Pressure

1.293 MPa

Density

STP

0.08988 kg/cm³

Gas

0.08988 kg/cm³

Heat

Molar Volume

19.94 cm³/mol

Atomic Volume

14.1 cm³

Heat Of Fusion USE

0.117 kJ/mol

Heat Of Fusion CRC

0.12 kJ/mol

Heat Of Fusion LNG

0.117 kJ/mol

Evaporation USE

0.904 kJ/mol

Evaporation CRC

0.9 kJ/mol

Evaporation LNG

0.904 kJ/mol

Molar Heat

28.836 J/molK

Heat Capacity CRC

28.836 J/gK

Heat Capacity LNG

28.84 J/gK

Heat Capacity WEL

28.82 J/gK

Thermal Conductivity

0.1815 W/m*K

Adiabatic Index

42862

Speed of Sound

Fluid

1310 m/s

Magnetic Properties

Order

Diamagnetic

Susceptibility

-2.5e-8 m3/kg

Etymology

Description

It is a colorless, odorless, gaseous chemical element. It is also the most abundant and lightest element in the universe. It is found in water and all organic compounds. It chemically reacts with many elements. It was discovered by Henry Cavendish in 1776.

Language Of Origin

Greek through Latin and French

Origin Of Word

From the combination of the Greek elements hydro- and -gen, meaning "water maker".

Meaning

water + forming

Symbol Origin

descriptive

Etymological Description

It derives from the French hydrogène and the Latin hydro- and -genes, and from the Greek phrase hydor geinomai, meaning "I make water".

Discovery & Isolation

Observed/Predicted By

H. Cavendish

Observed/Discovery Year

1766

Discovery Location

Isolated Sample By

Paracelsus

Isolated Sample Year

y. 1500

Named By

Antoine Lavoisier

Production & Use

Sources

Commercial quantities are obtained by reacting superheated steam with methane or carbon. It is also possible to obtain it in laboratory studies where metals react with acid solutions or electrolysis.

Uses

Large amounts of hydrogen are used in the production of ammonia. It is also used as fuel in balloons, metal refining, and rockets. Its two heaviest isotopes, deuterium (D) and tritium (T), are used for nuclear fission and fusion, respectively.

Radioactivity

Half Life

Stable

Lifetime

Stable

Neutron Mass Absorption

0.011

Neutron Cross Section

0.33

Electron Affinity

Electron Affinity (eV)

0.754195

Electron Affinity (kJ/mol)

72.769

Electron Affinity (pauling)

2.2

Electron Affinity (allen)

13.61

Electron Affinity (ghosh)

0.2638

Dipole Polarity

Accepted

4.50711

Uncertainty

0.00003

C6 GB

6.51

C6 Coefficient

6.499026705

Lattice

Constant Internal Default Radius

3.75

Constant

470, 470, 340

Strucutre

HEX

Angles

π/2, π/2, 2 π/3

Electron & Quantum

Oxidation States

−1,1

Electron Configuration

1s1

Quantum Number

2S1/2

Electron Configuration Semantic

1s1

Shells-0

Ionization Energies-0

1312

List of Compounds

1-10 of 85 compounds

Rows per page:

Formula	Names
D2	deuterium
^3H2	hydrogen-t2 molecular tritium
H2	liquid hydrogen liquefied hydrogen hydrogen dihydrogen Freon 702 hydrogen gas molecular hydrogen R-702
^3HH	tritium hydride
AsH3	arsine arsenic hydride arsenic trihydride arsenous hydride hydrogen arsenide
As2H4	diarsine
B2D6	diborane-d 610%in D2,electronic grade trideuterioborane
B2H6	diborane boroethane boron hydride diboron hexahydride
B4H10	tetraborane(10)
B5H9	pentaborane(9)

...

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