what is the oxigenic number of iron?, +3, -2, +6, -6, what is the speed of light?, 360 m/s, 36000 cm/s, 0.36 km/s, all of these correct, where is the halogen number ?, Na, f2, k, h2, the main atoms of the organic chemistry ?, c,H, o2,f, the atomic number of Luisim?, 3, 4, 12, 6.

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