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

Each energy level has sublevels There are 4 types of sublevel: S, P, D, and F

Each sublevel has orbitals Orbitals are locations within the atom where the e- are likely to be found Each orbital can hold 2 electrons

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

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

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

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

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-

Arrangement of e- in the atom 7 s 7 p 7 d 7 f 6 s6 p6 d6 f 5 s5 p5 d5 f 4 s4 p 4 d4 f 3 s 3 p3 d 2 s2 p 1 s

Arrangement of e- in the atom (aufbau) nucleus

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

What element is this? 1

2

2 1

Electron configuration for Ne ___ ___ ____ ____ ____ 1s2s 2p 226

Write the e- configuration of As 33

Write the e- configuration of As 33 ___ ___ ___ ___ ___ ___ ___ ___ ___ 1s 2 2s 2 2p 6 3s 2 3p 6 ___ ___ ___ ___ ___ ___ ___ ___ ___ 4s 2 3d 10 4p 3 e- will not pair up in p, d or f orbitals if there is room in the orbital for them to spread out !

1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 2 –

What element? 22 5

2262 3