The chemical formula for methane is CH4. Then there are four hydrogen atoms and one carbon atom in each molecule, making two distinct types of atoms.
there is only 1 element in a molecule of methane.
1
This is a molecule.
A molecular formula shows the numbers and kinds of atoms in a molecule but not the arrangement of the atoms.
Three atoms total, but only two different kinds: Hydrogen and Oxygen.
Add: Molecules that contain only carbon and hydrogen atoms are called hydrocarbons. The simplest one is methane. This may be represented by H | H-C-H | H This is found in farts and swamps. Other examples include gasoline, most kinds of plastics, ... the list is LONG.
A Polar Covalent bond
Molecule and compound comprises of different atoms. Atoms are combined in fixed ratio.
This is a molecule.
Two or more different kinds of atoms chemically combine to form a compound. The atoms make a molecule of that compound, which is the smallest individual component (part or piece) of that substance.P.S. That makes the answer Molecule.
A molecular formula shows the numbers and kinds of atoms in a molecule but not the arrangement of the atoms.
A compound.
Your question is not so clear. Methane has carbon and hydrogen atoms, the chemical formula being CH4. Dodecane contain also carbon and hydrogen atoms, the chemical formula being C12H26; the number of carbon and hydrogen atoms is here different. Or, otherwise it is clear that 10 g of methane contain more atoms than 1 g of methane.
a molecule
A combination of different kinds of atoms make up a molecule for example H2O means two atoms of hydrogen and one of oxygen.
Molecules are not always equivalent to molecules, as some molecules have more atoms than other molecules, and other molecules have different kinds of atoms than other molecules.
This a chemical compound, having 2 or 3 different atoms in the molecule.
Three atoms total, but only two different kinds: Hydrogen and Oxygen.
Two or more atoms chemically combined in a specific ratio are a molecule.