Wolfskill_Che131_F2011_Lect-25

Wolfskill_Che131_F2011_Lect-25 - 11/4/2011 Lec-25: Periodic...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
11/4/2011 1 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 1 Lec-25: Periodic Trends Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 2 Electron Configurations Electrons enter and fill orbitals according to four rules: Pauli Exclusion Principle Orbitals can contain a maximum of two electrons which must be of opposite spin. Aufbau or Build-up Principle Electrons enter and fill lower energy orbitals before higher energy orbitals. Hund's Rule electrons will enter the orbitals one- at-a-time to maximize degeneracy Madelung's Rule Orbitals fill with electrons as n + l Electrons can not have the same four quantum numbers
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11/4/2011 2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 3 Electron Configurations Electron configurations are reflected in the layout of the periodic table Be careful! Some tables shift the positions of the first f e Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 4 The electron configuration for Ca is ? 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 Ca [Ar]4s 2
Background image of page 2
11/4/2011 3 A. 0 B. 2 C. 4 D. 6 5 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 [Ar]4s 2 3d 6 4s 3d Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 6 Periodic Table
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11/4/2011 4 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 7 Periodic Table Periodic properties reflect electronic structure Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 8 Periodic Trends The size of an atom influences both physical and chemical properties. Note that the outer boundary of an atom is not well defined -> location of electron is not well defined
Background image of page 4
11/4/2011 5 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 9 Atomic Radius NOTE: H and He are reversed; r(H) > r(He) Interactions Determining Atomic Radii He: 2p
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

Wolfskill_Che131_F2011_Lect-25 - 11/4/2011 Lec-25: Periodic...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online