CHEM1011 Lecture Notes - Lecture 5: Bohr Model, Electron Configuration, Periodic Table
24 May 2018
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Lecture 5: Electron configuration
- Light emitted as an electron moves from a higher energy orbit to a lower energy orbit
Problems with the Bohr model
- What as orret aout Bohrs Model:
Electrons reside in quantized energy levels.
The Bohr model accurately and quantitatively predicts the energy levels of one
electron atoms.
- What as iorret aout Bohrs Model:
Eletros dot orit the uleus i ell-defined circular orbits.
Fails to accurately predict the energy levels in multielectron atoms (electrons
with more than one atom e.g. helium, nitrogen)
- Periodic table has blocks of elements
s lok eleets ide
p lok 6 eleets ide
d lok eleets ide
f lok 4 eleets ide
- Rows are divided
second row: 2 + 6
third row: 2 + 6
fourth row: 2 + 10 + 6
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Document Summary
Light emitted as an electron moves from a higher energy orbit to a lower energy orbit. The bohr model accurately and quantitatively predicts the energy levels of one electron atoms. Ele(cid:272)tro(cid:374)s do(cid:374)(cid:859)t or(cid:271)it the (cid:374)u(cid:272)leus i(cid:374) (cid:449)ell-defined circular orbits. Fails to accurately predict the energy levels in multielectron atoms (electrons with more than one atom e. g. helium, nitrogen) Ea(cid:272)h shell is di(cid:448)ided i(cid:374)to su(cid:271)shells (cid:272)alled s, p, d, f . There is one extra subshell for each new shell. Third shell: 3s and 3p and 3d. 2 electrons can fit into a s subshell. 6 electrons can fit into a p subshell. 10 electrons can fit into a d subshell. 14 electrons can fit into a f subshell. We originally thought we filled subshells horizontally, but we actually fill subshells diagonally. Li has 3 electrons: 1s^2 2s^1 (1s now full) B has 5 electrons: 1s^2 2s^2 2p^1 (2s now full) Ne has 10 electrons: 1s2 2s2 2p6.
