Yes, because every element has a specific combining capacity (valency) for example Mg is +2 and Cl is -1 so they must combine in ratio of 1;2.
Law of Definite Proportions
how reactive is radon and will it combine with other elements
Elements
Electrons are shared when elements combine to form molecules.
nuclear fusion
An element is a pure substance, two elements combine to form a compound.
john Dalton
The Law of Definite Proportions says that a given chemical compound always contains the same proportion by mass of its constituent elements. This is NOT the same as saying that elements always combine in a specific ratio, because they can combine in different ratios in different compounds. An example of this might be copper oxide which can be CuO or Cu2O, showing a different ratio of copper to oxygen. So, the answer to the question, as asked, is no, elements do not always combine in specific ratios.
A Molecule
John Dalton
Joseph Proust
Chemical Change caused by combining two elements at specific proportion.
The 20th century
This is a chemical compound.
Elements combine to form chemical compounds.
its schrodinger
John Dalton in 1803
What is the name of two or more elements in a fixed proportion?