why did mendeleev, among chemical properties concentrated on the compounds formed by elements with oxygen and hydrogen??
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the reaction between hydrogen (H2) and chlorine (Cl2) forms a new substance, hydrogen chloride (HCl).
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Among chemical properties, Mendeleev concentrated mainly on the compound formed by elements with oxygen and hydrogen. This means that when the elements are arranged in the order of their increasing atomic masses, the elements with similar properties recur at regular intervals.
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this is correct answer.
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