Silicon?

On Wed, 31 Aug 2011 16:24:08 -0500, David D. Hillman <[log in to unmask]> wrote:

>Hi folks - Here is the Friday Element Quiz Question a day early (I am
>taking vacation on Friday to whitewater kayak):
>
>The Question:
>
>References of this element can be traced back to documentation from
>ancient Babylon, Egypt and Rome. This element is used to make cosmetics
>have a silky feel and yet is the basis for many industry abrasives.
>Compounds of this element are being investigated as a treatment for brain
>tumors. This element is essential for plants and is added to fertilizers.
>This element is the basis for an insecticide for ants and cockroaches.
>This element has two naturally occurring isotopes with neither being
>radioactive. What element is being described?
>

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