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Non-metallic annotations
Non-metals are gases or brittle solids or liquids without metallic properties under normal conditions, such as the 15 elements in the upper right part of the periodic table and the element of hydrogen, the elemental element of group zero. Most non-metallic atoms have more valence shell S and P electrons, which can form a diatomic molecular gas or a crystal structure of skeleton, chain or layered macromolecules.