February 21, 2017

Homework Help: Science

Posted by LOVELY23 on Thursday, January 28, 2010 at 8:03pm.

Before 1937, all naturally occuring elements had been discovered, but no one had found any trace of element 43. Chemists were still able to predict the chemical properties of this element (now called technetium), which is widely used today for diagtnosing medical problems. How were these predictions possible? Which elements would you expect to be similar to technetium?

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