8 valence electrons and the area of a circle

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From: Jhumki Basu (sjbasu@hotmail.com)
Date: Wed Jan 22 2003 - 15:25:27 PST 

From: "Jhumki Basu" <sjbasu@hotmail.com>
Subject: 8 valence electrons and the area of a circle
Date: Wed, 22 Jan 2003 23:25:27 +0000
Message-ID: <BAY1-F22oftERQfKBZK0001774c@hotmail.com>

A couple of questions about which I wondered for a while:

1) Why is the area of a circle calculated using the formula (pi)(r^2)? Where does this formula come from?

2) Why are atoms stable generally stable when they have 8 valence electrons? What is magical about a noble gas configuration? Why do certain orbitals (s,p,d,f, etc.) only allow certain numbers of electrons? What determines this?

Thanks!

Jhumki


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