Sorry Mike but the quiz instructions are looking for answers. Since the "question" to the answer of "42" is a complete unknown then you will still need to furnish a response (for those who are lost, part of this discussion relates to the book "Hitchhiker's Guide to the Galaxy"). : - ) Also, Bev did not completely answer question #2 as he only listed an element and not an element oxide species! Dave Mike Fenner <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 07/10/2009 09:44 AM Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] NTC - Friday Elements Quiz So "42" is not sufficiently detailed then? If not then so far as I know there is more than 1 answer to Questions 1 and 2 Regards Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian Sent: 10 July 2009 14:56 To: [log in to unmask] Subject: Re: [TN] NTC - Friday Elements Quiz #1 Bismuth #1A infinite. It is a stable element at the end of one or more radioactive element decay series. #2 I will guess it is plutonium 238. Bev RIM ----- Original Message ----- From: TechNet <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Sent: Fri Jul 10 09:49:42 2009 Subject: [TN] NTC - Friday Elements Quiz Hi folks - Its Friday, its raining like crazy in Iowa, and a gloomy day so here is a TechNet Friday elements quiz. The ground rules are simple: No using Wikipedia (other internet resources are allowed) and the first correct complete answer will get to have a Diet Mt. Dew from Doug! Question #1: Which element expands upon freezing? Question #1A: What is the half life of this element? Question #2: The thermoelectric generators on the Voyager, Galileo and Cassini spacecraft utilize the radioactive decay heat from a radioactive element oxide and have logged over 250 million thermoelectric operating hours with no failures - name the element oxide. Good Luck! 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