The dot and cross diagram shows that a water molecule is made up of one oxygen atom joined to two hydrogen atoms, so the formula of water is H 2 O. A nitrogen molecule is made up of two nitrogen ...

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Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, 16146 Genova, Italy Institute of Structure of Matter, National Research Council (CNR), nM2-Lab, Via Salaria ...