H2O
The little 2 is a subscript that tells you that there are 2 Hydrogen atoms in the compound. There is no 1 after the Oxygen because if there is no subscript, there is an understood 1 atom in the compound.
It is common knowledge that the chemical formula for water is H2O. In chemical formulae, subscripts apply to the letters that they go after. So there are 2 Hydrogens in a single water molecules.
2 atoms of hydrogen & 1 atom of oxygen, hence the formula H2O
Subscripts indicate the number of the preceding element Ie. in H2O there are two hydrogens (H) and one oxygen (O) or in C6H12O8 there are six carbon (C) twelve hydrogen (H) and eight oxygen (O) The number of atoms of the same element in the molecule
H2O is the chemical formula for water. It can be separted into H2 = 2 hydrogen atoms O = 1 oxygen atom . Structurally they are arranged as H-O-H . Water is the universal name , but reading the formula it you could describe it as :- Hydrogen monoxide Dihydrogen oxide Hydrogen oxide Dihydrogen monoxide. However , nobody does, unless you wish to play 'silly tricks'.
a coefficent in physical science means:a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product that are involved in a reaction
The number of hydrogen atoms of present in a hydrogen molecule are 2.
Hydrogen atoms
The formula for 2 atoms of hydrogen and 2 atoms of oxygen is H2O2, which represents hydrogen peroxide.
The formula H2O2 represents hydrogen peroxide, which consists of two hydrogen atoms and two oxygen atoms. The ratio of hydrogen to oxygen atoms is 2:2, indicating that there are equal numbers of each atom in the molecule.
The formula for hydrogen phosphate ion is: H2PO4−
In the formula 2NaOH, the number 2 is called a coefficient. It indicates that there are 2 moles of NaOH present in the compound.
a subscript
The formula for cuprous hydrogen carbonate is Cu(HCO3)2.
The formula for lithium hydrogen sulfite is LiHSO3.
Assuming you're talking about the chemical formula for water (H2O) - It means that for every atom of Oxygen (O) there are two atoms of Hydrogen (H)
The formula for magnesium hydrogen tellurate is Mg(H2TeO4)2.
The chemical name is calcium hydrogen carbonate.