ELECTRON CONFIGURATION & THE PERIODIC TABLE, Summaries of Chemistry

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ELECTRON

CONFIGURATION & THE

PERIODIC TABLE

• The periodic table is a tool
• Electron location can be determined using the periodic table

H He

s 2 s 1

S- block

d block

d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10

• D orbitals fill up after previous energy level so first d is 3d even though it’s in row 4. 1 2 3 4 5 6 7 3d

Long Periodic Table

• f orbitals start filling at 4f

4f

5f

Electron Configuration & Ions

• Ion – atom that has gained or lost electrons
• Lose electrons – positive charge
• Gain electrons – negative charge
• Na  Na

  • • e

• 11 electrons  10 electrons
• 1s 2 2s 2 2p 6 3s 1  1s 2 2s 2 2p 6

ELECTRON CONFIGURATION SHORTHAND Yes!! There is an easier way!

More examples

• Ge = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 2
• Ge = [Ar] 4s 2 3d 10 4p 2
• Hf =1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 2
• Hf =[Xe]6s 2 4f 14 5d 2

The Shorthand Again

Sn- 50 electrons The noble gas before it is Kr [ Kr ] Takes care of 36 Next 5s^2 5s 2 Then 4d^10 4d 10 Finally 5p^2 5p 2