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Unformatted text preview: d its particular set of chemical properties. Any set of elements in the same period have their highest
energy electrons in s and p orbitals with the same value of n.
OUTERMOST electrons (the ones in the last s and p orbitals) are called VALENCE electrons.
The INNER ones are the CORE electrons.
C is 1s2 2s2 2p2
Cl is 1s2 2s2 2p6 3s2 3p5 OR just [Ne] 3s2 3p5
Any chemical reaction just involves shuffling valence electrons!
The group number of an element shows how many valence (outer) electrons it has.
(transition metals and the f-block are a little more complex, and we won’t discuss them)
Having 8 valence electrons causes an atom to be very stable. This is why noble gases are so unreactive....
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