It means that two hydrogen atoms combine to form one hydrogen molecule.
Hydrogen is a gas. H2 is the description of its molecular structure (2 hydrogen atoms bound together).
in HTML <h2> stands for heading 2
'H2' is a Hydrogen molecule (2 atoms of hydrogen joined together) - Hydrogen in its natural state (the gas) exists as the hydrogen molecule. A single atom of Hydrogen is just 'H'
Hydrogen is a diatomic element, so the formula would be H2.The chemical symbol is H, but hydrogen usually appears as H2.
H2 is the symbol for the diatomic molecule of hydrogen; 2 H meaning is two hydrogen atoms.
2 Lithium Hydroxide & 2 Hydrogen Molecules
Hydrogen exist as H2.It has 2 atoms in a molecule.
2: As a gas the molecules of hydrogen have the formula H2.
Two hydrogen atoms can form a hydrogen molecule by sharing their electrons through a covalent bond. This molecule is represented by H2.
H2S is the formula of Hydrogen sulfide.
Hydrogen gas has the symbol H2 because in its molecular form, it exists as two hydrogen atoms bonded together sharing electrons. The subscript "2" in the formula H2 indicates that there are two hydrogen atoms in one molecule of hydrogen gas.
H stands for the element hydrogen. H2 is hydrogen molecule and is not listed on the periodic table.