Discussion 4

# Discussion 4 - Chem 20A Discussion 4 Oct 2009 TA Guangye...

This preview shows pages 1–2. Sign up to view the full content.

Chem 20A Discussion 4 Oct. 2009 TA: Guangye Zhang 1. Various Representations of (1) How we got these figures See page 175-181 of Oxtoby. (2) What does 90% surfaces mean? Why don’t we use 100% surfaces? The probability of finding electrons in the orbital shapes (contours) we used is 90%. 100% is the whole space. (3) What is the meaning of ‘+’ and ‘-‘ (or Red and Blue) in the shapes of the orbital? When wave function is positive, it is +; when wave function is negative, it is -. 2. Nodes (1) Definitions of radial and angular nodes -A radial node is a spherical surface about the nucleus on which _ _ and ____ are 0. -An angular node is usually a _plane_ _ on which there is zero probability for finding the electron and across which the _ _ ___ changes sign. (2) How to calculate the number of nodes for given n and l Radial nodes=_ n- l -1_____ _ __; Angular nodes (planes)=_ __ l ____ __; Total nodes= _n-1__ (3) Examples: Calculates the Radial and angular nodes and the total nodes of the following orbitals: 1s 4s 5d 7f Radial nodes 0 3 2 3 Angular nodes 0 0 2 3 Total nodes 0 3 4 6 3. Electron Configuration (1) Difference for Energy Levels between 1-electron system and Many-electron system

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern