Todays goals

1
Todays goals

• Pauli exclusion principle
• Orbital influence on periodic table
• Electron configurations

2
Ch. 8 Topics

• Orbital filling
• Pauli exclusion principle (unique quant s)
• spectroscopic (spdf), noble gas, orbital box
  diagrams
• core electrons vs valence electrons
• Hunds Rule electrons prefer parallel spins
• Subshell filling
• enegy increases as (n l)
• for subshells with same (n l), lower l has
  lower E
• Periodic table ultimate cheat sheet
• Z, l vs Z, influence on atomic size
• Ionization energy, electron affinity

3
Admin stuff

• Ch.8 OWLs Due Thur, Mon
• Reading current Ch. 8
• (magnetism, configurations)
• Test 2 Mon, Oct 23th, 600-730 PM

4
Quantum number review

• Principal (n) Describes energy, shell
• n 1, 2, 3,
• Angular momentum (l) Describes shape,
  subshell
• l 0, 1, n-1 --gt s, p, d, f
• Magnetic (ml) Describes orientation, 2px or 2py
  or 2pz
• ml - l, , l
• Spin (ms) Allows 2 electrons per orbital, up
  or down
• Pauli exclusion principle no two electrons of
  an atom can have the same 4 quantum s.

5
Periodic table the chemists cheat sheet

• What value of l signifies a d-orbital?

6
Periodic table the chemists cheat sheet

• What is the lowest value of the principal quantum
  number n that a d-orbital can have?

7
Periodic table the chemists cheat sheet

• How many electrons can be contained within a 5dxy
  orbital?

8
Periodic table the chemists cheat sheet

• How many electrons can be contained within the 4d
  subshell?

9
Periodic table the chemists cheat sheet

• What value of l signifies a d-orbital?
• What is the lowest value of the principal quantum
  number n that a d-orbital can have?
• How many electrons can be contained within a 5dxy
  orbital?
• How many electrons can be contained within the 4d
  subshell?

2
3
2
10
10
Influence of orbitals on periodic table(s-block,
p-block, d-block, f-block)

• l 0
• l 1
• l 2
• l 3

2 e- 6 e- 10 e- 14 e-
s p d f

• n 1 s 2e- (1s)
• n 2 s p 2 6 8e- (2s,2p)
• n 3 s p d 2 6 10 18e- (3s,3p,3d)
• n 4 s p d f 2 6 10 14 32e-
• (4s,4p,4d,4f)

l 0 1 2 3
11
Influence of orbitals on the periodic table
Z
2e
2
8e
10
8e
18

• n 1 s 2e-
• n 2 s p 8e-
• n 3 s p d 18e-
• n 4 s p d f 32e-

18e
36
18e
54
32e
86
Lanthanides (Ce to Lu) 4f
Actinides (Th to Lr) 5f
12
Orbitals of the periodic table
1s
1s
2s
3s
4s
5s
6s
7s
Lanthanides (Ce to Lu) 4f
Actinides (Th to Lr) 5f
13
Configurations for some elements

• Spectroscopic (spdf) notation
• Noble gas notation core vs valence electrons
• Orbital box diagrams
• B, O, Mg, Cl, As, transition metals

Will the first two electrons placed in oxygens
2p subshell prefer to occupy the same 2p orbital
or two different 2p orbitals? A Same B
Different