ii. quantum theory. a. review of atomic theory thomson discovered the electrons bohr determined...
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B. Electron Configuration Electron can jump multiple levels: 1 energy level (red light) 2 energy levels (green light) 3 energy levels (blue light) 4 energy levels (violet light)TRANSCRIPT
II. Quantum Theory
A. Review of Atomic TheoryThomson
Discovered the electronsBohr
Determined electrons travel around the nucleus according to energy; electrons with lower energy are closer to the nucleus
Quantum Mechanical Model or Electrons Cloud ModelElectrons orbit the nucleus in
“clouds”; high probability of finding them somewhere along these paths
B. Electron ConfigurationElectron can jump multiple levels:
1 energy level (red light) 2 energy levels (green light) 3 energy levels (blue light) 4 energy levels (violet light)
B. Electron Configuration Cont.Electrons orbit in specific energy
levels.There are seven energy levelsLowest energy level = smallest
and the closest to the nucleusEach energy level has a specific,
limited number of electrons
C. Energy Levels, Sublevels, & Orbitals
The lowest energy level is n = 1
On the periodic table, each period (horizontal row) is an energy level
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C. Energy Levels, Sublevels, & Orbitals
Each energy level has energy sublevels: s, p, d, f
Each energy sublevel has different number of orbitalsOrbitals: 3-D clouds where
electrons are found 90% of the time
Each orbital can hold 2 electrons
s sublevel = 1 orbital (2 electrons)
p sublevel = 3 orbitals (6 electrons)
d sublevel = 5 orbitals (10 electrons)
f sublevel = 7 orbitals (14 electrons)
C. Energy Levels, Sublevels, & Orbitals
ENERGY LEVELSSublevels (s, p, d, f)
Orbitals (1, 3, 5, 7)
Energy Level (n)
Sublevels # orbitals Max # e-
1 s 1 22 s
p13
2 6 (8 total)
3 spd
135
26
10 (18 total)4 s
1357
2610
14 (32 total)
III. Electron Configuration
A. Electron ConfigurationUnabbreviated method for describing the
arrangement of electronsExample: Helium (2 electrons)
Helium: 1s2
Energy LevelSublevel
# electrons
C. Energy Levels, Sublevels, & Orbitals
A. Electron ConfigurationExample: Neon (10 electrons)
Neon: 1s22s22p6
A. Electron ConfigurationExample:
Neon: 1s22s22p6
Tips to Remembering Electron ConfigurationSimply count, left to right, and know where s, p,
d, and f block are on the periodic table
B. Noble Gas ConfigurationAbbreviated electron configurationWrite full electron configuration for both Neon
(Ne) and Argon (Ar)Neon: 1s22s22p6
Argon:1s22s22p63s23p6
Argon: [Ne] 3s23p6