Oxygen (O) and hydrogen (H) are the only two that are found in both.
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Water itself is not on the periodic table of elements because it is a compound, however as you probably know, the chemical equation of water is H2O. That means there are 2 atoms of hydrogen and 1 oxygen atom in each molecule of water. Both hydrogen and oxygen can be both found on the periodic table.
Silicates.
The common chemical elements found in both DDT (dichlorodiphenyltrichloroethane) and Freon (chlorofluorocarbons) are carbon, chlorine, and hydrogen.
Both of them are planets. Water is found on both of them.
Yes, gold and silver are native elements, which means they can be found in their pure form in nature without being chemically combined with other elements.