Not necessarily. Not even usually.
The proportions of elements in a compound are fixed, meaning that a specific compound will always have the same ratio of elements by mass. This fixed ratio is determined by the chemical formula of the compound.
what is a fixed position and vibrate on the spot
The meaning of fixed is to fasten in a secured position.
The fixed ratio of a chemical compound is known as its stoichiometry. This ratio is the quantitative relationship between the number of atoms of each element in the compound, as expressed by the compound's chemical formula.
Compound
compound contains elements in a fixed proportion. Example= NaCl
If a material contains three elements joined in a fixed proportion, then it is a compound. It can only be separated by a chemical reaction.
In medical terms, "immobilize" means to keep in a fixed position.
Membranes can be demonstrated easily by labeling the plasma membrane proteins of not fixed in position.
A chemical compound that has a set number of atoms for each element. E.g. water H2O has the fixed ratio of 2:1, that is 2 hydrogen atoms to 1 oxygen atom, carbon dioxide CO2 has a fixed ratio of 1:2 (1 carbon atom to 2 oxygen atoms). It has to be fixed as if it isn't it makes a new compound/chemical.
Chemical
A compound has a fixed chemical composition, and snowflake is ice = water = H2O.