Determine the oxidation state of atoms in the following compounds: SiCl4, Mgl2, SF6, NaBr, HCL, H2O, NH3.

1) SiCl4: silicon +4; chlorine -1.
2) MgI2: magnesium +2; iodine -1.
3) SF6: sulfur +6; fluorine -1.
4) NaBr: sodium +1; bromine -1.
5) HCl: hydrogen +1; chlorine -1.
6) H2O: hydrogen +1; oxygen -2.
7) NH3: nitrogen -3; hydrogen +1.



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