The number of atoms present in a given molecule.
Water ; H2O ; means TWO hydrogen atoms and ONE oxygen atoms
Similarly
Carbon dioxide ; CO2 ; means ONE atom of carbon and TWO atoms of oxygen in the molecule.
NB
Although 'Answer'com' does not allow me to show it, these numbers after an atom should be written 'subscript'.
coefficients
A subscript belongs immediately after the symbol of an element in a chemical formula to indicate the number of atoms of that element present in the compound. It is written as a small number at the bottom right of the element's symbol.
The smallest number written to the right of a chemical equation is the coefficient, which represents the number of molecules or formula units of a substance involved in the reaction.
The number after a chemical symbol in a chemical formula represents the number of atoms of that element in a single molecule. This number is called a subscript, and it indicates the ratio of atoms in the compound.
The subscript in a chemical formula refers to the number of atoms of that element present in the molecule. It is a small number written at the lower right of the element symbol. For example, in the formula H2O, the subscript 2 indicates that there are two hydrogen atoms in each water molecule.
The subscript indicating the number of atoms relative to a chemical symbol is located immediately after the chemical symbol and is written in a smaller font size at the bottom right corner of the symbol.
coefficients
A coefficient is the number that goes before an element when your balancing the equation. And a subscript is the number after the element. Subscripts are not changed when you balance the equation.
A subscript belongs immediately after the symbol of an element in a chemical formula to indicate the number of atoms of that element present in the compound. It is written as a small number at the bottom right of the element's symbol.
The smallest number written to the right of a chemical equation is the coefficient, which represents the number of molecules or formula units of a substance involved in the reaction.
The small number used to represent the number of ions of a given element in a chemical formula is called a subscript. Subscripts are written to the right of the element's symbol and indicate the number of atoms or ions present.
In a chemical formula, a subscript is a number written to the right and slightly below the symbol for the chemical element. If the subscript is 1, it is not written. The subscripts for the chemical formula for water, H2O, are 2 for hydrogen and 1 for oxygen. The subscripts for the chemical formula for glucose, C6H12O6, are 6 for carbon, 12 for hydrogen, and 6 for oxygen.
Subscripts represent the number of atoms of an element in a molecule. They are written as small numbers to the right of the element symbol in a chemical formula. They indicate the ratio of elements in a compound.
The number after a chemical symbol in a chemical formula represents the number of atoms of that element in a single molecule. This number is called a subscript, and it indicates the ratio of atoms in the compound.
The subscript in a chemical formula refers to the number of atoms of that element present in the molecule. It is a small number written at the lower right of the element symbol. For example, in the formula H2O, the subscript 2 indicates that there are two hydrogen atoms in each water molecule.
Ions are atoms or molecules that have a positive or negative charge. The chemical formula for ions includes the symbol of the element followed by the charge in superscript. For example, the sodium ion is written as Na+, and the chloride ion is written as Cl-.
Right and down the symbol of a chemical element.