Lecture 3 (Electron Configuration, Shielding, IE, etc.)

Question 1

What are the electron configuration exceptions that we studied?

Answer 1

Cr ([Ar]3d^(5)4s^(1)) and Cu([Ar]3d^(10)4s^(1))

Question 2

What electron configuration is particularly stable?

Answer 2

filled and half-filled subshells

Question 3

What is the ranking for the orbitals that have higher radial distribution function values? Why?

Answer 3

ns > np > nd

ns electrons are closer to the nucleus than np electrons, and these more than nd electrons; more penetrating

Question 4

What do the inner electron shells shield from the outer shells?

Answer 4

Nuclear charge

Question 5

What does outer electrons experience corresponding to Zeff and Z?

Answer 5

The electrons experience and effective charge, Z eff, smaller than the nuclear charge, Z.

Question 6

What is slater’s rule?

Answer 6

Zeff=Z-S, where S= shielding constant

Question 7

What is the shielding constant for (ns, np) groups?

Answer 7

S=0.35

Question 8

What is the shielding constant for (n-1) shell?

Answer 8

S=0.85

Question 9

What is the shielding constant for (n-2) or lower shells?

Answer 9

S=1

Question 10

What is the shielding constant for (nd, nf) groups?

Answer 10

S=0.35

Question 11

What is the shielding constant for electrons in the lower groups (nf>)?

Answer 11

S=1

Question 12

What is the first ionization energy of an atom?

Answer 12

The internal energy change