721 Electronic Spin Quantum Number Has values of Electronic spectra show

# 721 electronic spin quantum number has values of

This preview shows page 7 - 11 out of 12 pages.

are allowed for an orbital with n=2? 7.21 Electronic Spin Quantum Number Has values of Electronic spectra show magnetic moment with two values Leads to Pauli exclusion principle -no two electrons in an atom can have the same 4 quantum numbers 7.23 Question What are four quantum numbers one random e - in each subshell with a principal quantum number n=3?
Chapter 7 Quantum Mechanics 7.24 Nodes Total number of nodes = Angular nodes = Radial nodes = 7.25 Orbital energy for a one electron atom All orbitals with the same principal quantum number have A larger n values means Electrons in the have the lowest energy possible The ground state for a one electron H atom is 7.25 Orbitals with more than one electron In many e - systems energy depends on < < < e - will go into the lowest energy orbitals first 7.26 Penetration 2p has maximum probability 2s has small but significant electronic probability 2s to the nucleus more than 2p 2s is than 2 p 1s 2s 3s 2p 3p
Chapter 7 Quantum Mechanics 2.27 Magnetic Properties Diamagnetic – Paramagnetic – 7.28 History of the Periodic Table Elements grouped by properties Mendeleev is given the most credit for the current version of the periodic table Mendeleev was able to successfully predict properties of unknown elements 7.29 Periodic tables Main group (representative elements) Transition metals Lanthanides and Actinides 7.30 Electron configurations: Hydrogen Helium Lithium C Mn Mn 2+ 7.31 Aufbau Principle e - s are added to hydrogen–like orbitals Follow order of periodic table Start with 7.32 Hund’s Rule Lowest energy configuration for an atom 7.33 Valence and Core e - s Valence e - s are in the shell with the outermost Atoms with the same number of valence e - have They are in the same for the main group elements Core e - s are the inner e - s Core e - s shield the valence electrons
Chapter 7 Quantum Mechanics 7.34 Periodic Trends Two key conflicting properties 1) 2) 7.35 Effective nuclear charge Z is the number of Positive charge Core electrons valence electrons Z eff = S is a scaling factor No easy way to know S and therefore Z eff Core charge can serve as an approximation Core charge = 7.36 Ionization Energy Energy required to \$O²J± Æ Al + ²J± + e - I 1 ¶¸¹ kJ/mol Al + ²J± Æ Al 2+ ²J± + e - I 2 º¸º¶ kJ/mol Al 2+ ²J± Æ Al 3+

#### You've reached the end of your free preview.

Want to read all 12 pages?

• Fall '08
• Kenney