CHEMISTRY

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Can someone tell me if I am getting these correct?
Give formula for the following covalent compounds:
1. Sulfur hexafluoride-SF6
2. Tetraphosphorus heptasulfide-P4S7
3. Silicon tetrachloride-SiCl4
4.Disulfur decafluroine moniodide-S2F10I
5. Iodine pentafluoride-IF5
6. Tetranitrogen trisulfide-N4S4
7. Diarsenic trisulfide-As2S3

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