A new element, setonium, has been isolated and, consistent with some predictions

Question

A new element, setonium, has been isolated and, consistent with some predictions, is nonradioactive. While only nanogram amounts are available, spectroscopic analysis (X-ray photoelectron spectroscopy, etc.) suggests that setonium is in the same family as chromium and will share many of its chemical properties, including most common oxidation state. Preliminary analysis suggests that the air stable form of setonium has a radius of 130 pm. Predict the formula of the form (cation, anion or oxide) in which it would likely be found in a beaker of pH 5.5 to 7 water.

Explanation / Answer

The hint seems to be that the new element is in the same family as chromium so it should have the same charge as other elements in that same group (Cr, Mo, etc) Each of those ions can have cation charges ranging from +2 to +6, unlikely to be an anion. However its most stable oxidation is Cr 3+ but Cr3+ ions are rarely present at pH values over 5, because hydrated chromium oxide (Cr(OH)3) is hardly water soluble (so we would assume that this new element would behave similarly). I would assume that the oxidation state this new element would take then is +6 cation because that is the next highest commonly found oxidation in the environment. http://www.lenntech.com/periodic/water/chromium/chromium-and-water.htm

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