Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: How many chemical elements are [Metal] as well as in the same series as [Oxygen]?
answer: 4
answer type: Chemical Element.
auxiliary information: A metal is a material that is typically hard, opaque, shiny, and has good electrical and thermal conductivity. Metals are generally malleable ‚Äî that is, they can be hammered or pressed permanently out of shape without breaking or cracking ‚Äî as well as fusible and ductile. About 91 of the 118 elements in the periodic table are metals. The meaning of "metal" differs for various communities. For example, astronomers use the blanket term "metal" for convenience to collectively describe all elements other than hydrogen and helium. Thus, in astronomy and physical cosmology, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. In addition, many elements and compounds that are not normally classified as metals become metallic under high pressures; these are formed as metallic allotropes of non-metals.Oxygen:;Type: Chemical Element. ;

What is the number of chemical elements that are [Metal] and also belong to the same series as [Oxygen]?