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Iridium is a stable metal that chemically unreactive, like platinum and gold. Iridium is the most resistant to oxidation of all metals. It can be used is as a hardening agent in alloys with Platinum and Osmium. Sometimes used in medical therapies e.g. treating prostate cancer by radiation therapy.
Rubidium is in group 1 (IA) of periodic table (Alkali Metal). Its electron valence is 1. In order to fulfill the octet rule, one electron on the outer shell is removed. That's why the ionic version of Rubidium is [math]Rb^+[/math].(cation) This al...