Write the expression of ONE HYDROGEN molecule?

Answer 1

H2

Answer 2

This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see hydrogen atom.
1 (none) ← hydrogen → helium
-
↑
H
↓
Li
Periodic Table - Extended Periodic Table
General
Name, Symbol, Number hydrogen, H, 1
Chemical series nonmetals
Group, Period, Block 1, 1, s
Appearance colorless
Atomic mass 1.00794(7) g·mol−1
Electron configuration 1s1
Electrons per shell 1
Physical properties
Phase gas
Density (0 °C, 101.325 kPa)
0.08988 g/L
Melting point 14.01 K
(−259.14 °C, −434.45 °F)
Boiling point 20.28 K
(−252.87 °C, −423.17 °F)
Triple point 13.8033 K, 7.042 kPa
Critical point 32.97 K, 1.293 MPa
Heat of fusion (H2) 0.117  kJ·mol−1
Heat of vaporization (H2) 0.904  kJ·mol−1
Heat capacity (25 °C) (H2)
28.836  J·mol−1·K−1
Vapor pressure P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 15 20
Atomic properties
Crystal structure hexagonal
Oxidation states 1, −1
(amphoteric oxide)
Electronegativity 2.20 (Pauling scale)
Ionization energies 1st: 1312.0 kJ/mol
Atomic radius 25  pm
Atomic radius (calc.) 53  pm (Bohr radius)
Covalent radius 37  pm
Van der Waals radius 120 pm
Miscellaneous
Thermal conductivity (300 K) 180.5 m W·m−1·K−1
Speed of sound (gas, 27 °C) 1310 m/s
CAS registry number 1333-74-0
Selected isotopes
Main article: Isotopes of hydrogen iso NA half-life DM DE (MeV) DP
1H 99.985% H is stable with 0 neutrons
2H 0.0115% H is stable with 1 neutron
3H trace 12.32 y β− 0.019 3He
References

Hydrogen (IPA: /ˈhaɪdrə(ʊ)dʒən/), is a chemical element that has the symbol H and an atomic number of 1. At standard temperature and pressure it is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas (H2). With an atomic mass of 1.00794 g/mol, hydrogen is the lightest element.

Answer 3

the hydrogen molecule consists of the two atoms so: H2 (2 is lower index). It's called diatomic molecule

Answer 4

I believe it is Expression= 1 Hydrogen Molecule
or not, i never studied physics, so i dont it's the right expression. Just wanted to help you, purely out of good conscious.

Answer 5

one molecule is H2
one atom is H

Answer 6

O

Answer 7

H

Answer 8

H

Answer 9

H

Answer 10

H