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. 2020 Nov 30;11:6125. doi: 10.1038/s41467-020-19745-2

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© The Author(s) 2020

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Fig. 5 — Non-metal region of the Periodic Table showing the elements (yellow and orange) able to form crystalline X₂H₂ vdW compounds (X = CH₄¹⁹, PH₃, H₂S²⁶, H₂Se²⁷, HI⁵⁷) having the I4cm (I4/mcm) structure, with P (X = PH₃), highlighted in orange, representing the so far missing tile for group 15 elements reported in this study (see text).