O2 meaning Oxygen, the subscript 2 means that oxygen generally doesn't run around as single atoms. Instead, oxygen pairs up, with each oxygen atom bonding with another to form a molecule.
It describes the di-atomic (di = 2) character of the oxygen molecule (O2) as found in gas. This indicates the build up of the oxygen molecule (O2) consting of two bonded oxygen atoms (O atoms)
Not O3, which is ozone. But O-2 is the most common ion of oxygen.
Molecules of oxygen exist in two relatively stable allotropes: breathable oxygen with the formula O2, and ozone with the formula O3. The little number indicates that these molecules are composed of (respectively) two or three oxygen atoms.
Its molecular formula will be Be(O2)2 but it can also be written in empirical formula as BeO4
The chemical formula for water, liquid, solid or gaseous is the same - H2OIn some texts you will find a little cursive L in brackets to indicate that it is liquid, or a little g to indicate gas, or a little s to indicate solid.
The subscript 2 indicates that there are two oxygen atoms bonded together in the molecule of oxygen gas (O2).
Subscipt
It describes the di-atomic (di = 2) character of the oxygen molecule (O2) as found in gas. This indicates the build up of the oxygen molecule (O2) consting of two bonded oxygen atoms (O atoms)
Diatomic elements consist of two atoms.The formula of these elements are always written with a subscript 2 in its symbol to indicate its molecular composition.examples: H2,O2.
The chemical formula for the oxygen in the air is O2, where the 2 should be a subscript.
The chemical formula for hydrogen peroxide is H2O2.
Not O3, which is ozone. But O-2 is the most common ion of oxygen.
Molecules of oxygen exist in two relatively stable allotropes: breathable oxygen with the formula O2, and ozone with the formula O3. The little number indicates that these molecules are composed of (respectively) two or three oxygen atoms.
O2- is the formula for oxide ion. The negative symbol indicates the presence of anions and 2 represents the oxidation state.
4 Na + O2 --> 2 Na2O
The chemical equation is:6 Na + 2 O2 = 2 Na2O + Na2O2
The subscript refers to the number of the specific atom or, if parentheses are present, group of atoms, in a molecule or formula unit. No subscript is given if there is only one such atom per molecule. For example, H2O is the formula for water. the subscripted 2 shows that there are two hydrogen atoms in the molecule.