- Using Uv-vis, where will the elemental S peak occur?

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What is the formula for this ionic crystal Ba O? We know that (-1)^n generates the sequence -1, 1, -1, 1, -1, ........ What formula generates -1, -1, 1, 1, -1, -1, 1, 1, ...........? Butter or margarine? Math help? Please explain too.? Aportaciones de newton sobre el movimiento de la tierra y el universo:?