Arrangement of e

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Arrangement of e-

• e- are arranged in ENERGY LEVELS
• There are 7 energy levels
• Level 1 is closest to the nucleus and has the
  lowest energy
• Level 7 is farthest from the nucleus and
• has the highest energy

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Each energy level has sublevels

• There are 4 types of sublevel
• S, P, D, and F

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Each sublevel has orbitals

• Orbitals are locations within the atom where the
  e- are likely to be found

Each orbital can hold 2 electrons
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S sublevel orbitals
S orbitals are Spherical shapes
There is one S orbital 1 S x 2 e- 2 e- can fit
in S sublevel
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P sublevel orbitals

• P orbitals are peanut shaped

There are 3 P orbitals, one in each dimension. 3
P x 2 e- 6 e- can fit in P Sublevel
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D sublevel orbitals

• D orbitals are double peanut shaped

There are 5 D orbitals 5 D x 2 e- 10 e- can
fit in D sublevel
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F sublevel orbitals

• F orbitals are fancy shaped

There are 7 D orbitals 7 D x 2 e- 14 e- can
fit in F sublevel
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To Summarize

• 7 energy levels
• 4 sublevels ( S, P, D, F)
• S orbitals holds 2 e-
• P orbitals holds 6 e-
• D orbitals holds 10 e-
• F orbitals holds 14 e-

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Arrangement of e- in the atom

• 7 s 7 p 7 d 7 f
• 6 s 6 p 6 d 6 f
• 5 s 5 p 5 d 5 f
• 4 s 4 p 4 d 4 f
• 3 s 3 p 3 d
• 2 s 2 p
• 1 s

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Arrangement of e- in the atom (aufbau)
nucleus
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Writing electron configurations

• ____ represents an orbital
• represents an e- with up spin
• represents an e- with down spin
• _____ two e- of opposite spin fill the orbital

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What element is this?
1
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What element is this?
2
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What element is this?
1
2
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Electron configuration for Ne

• ___ ___ ____ ____ ____
• 1s 2s 2p

2
2
6
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Write the e- configuration of As
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Write the e- configuration of As
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___ ___ ___ ___ ___ ___ ___ ___ ___
1s2 2s2 2p6 3s2
3p6 ___ ___ ___ ___ ___ ___ ___
___ ___ 4s2 3d10
4p3
e- will not pair up in p, d or f orbitals if
there is room in the orbital for them to spread
out !
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1s2 2s2 2p6 3s2 3p6 4s2
2 8 - 8- 2
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What element?
5
2
2
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What element?
2
2
6
2
3