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Unformatted text preview: n), WITHOUT GOING
OVER the number of electrons in
the atom (or ion). Write the noble
gas in brackets [ ].
• Step 2: Find where to resume by
finding the next energy level.
• Step 3: Resume the configuration
until it’s finished. 47 48 Shorthand Notation
– Longhand is 1s2 2s2 2p6 3s2 3p5
You can abbreviate the first 10
electrons with a noble gas,
Neon. [Ne] replaces 1s2 2s2 2p6
The next energy level after Neon
So you start at level 3 on the
diagonal rule (all levels start
with s) and finish the
configuration by adding 7 more
electrons to bring the total to 17 [Ne] 3s2 3p5 49 Practice Shorthand Notation
• Write the shorthand notation for
each of the following atoms:
Bi Valence Electrons
Electrons are divided between core and
Electrons valence electrons
B 1s2 2s2 2p1
Core = [He] , valence = 2s2 2p1
valence Br [Ar] 3d10 4s2 4p5
Core = [Ar] 3d10 , valence = 4s2 4p5
valence 50 Rules of the Game 51 No. of valence electrons of a main group
atom = Group number (for A gro...
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