Osmium, Os, with a density of 22.57 g/cm3 is the densest metal on the periodic table. a) What is the full electron configuration and noble gas notations of osmium? b) What are the noble gas configurations of Os+ and Os3+
 c) The most abundant isotope of osmium is 190Os. What is the combined mass of neutrons in a 1.00 g sample of 190Os?

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