# Write the noble gas in brackets step 2 find where to

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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 • Chlorine – 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 is 3 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: Cl K Ca I Bi Valence Electrons Valence Electrons Electrons are divided between core and Electrons valence electrons valence 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 No. atom = Group number (for A gro...
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