Q of the Day Day Energy levels - break into - __________ - break into - _________ sublevelsorbitals 2. What do each of the 4 quantum numbers signify (what does each one tell you?)?

Electron Configurations Practice: S F 1s 2 2s 2 2p 6 3s 2 3p 4 1s 2 2s 2 2p 5 P 1s 2 2s 2 2p 6 3s 2 3p 3

Objective / Essential Question How do we define / describe an electron’s location in the atom?

Electron Configurations Practice: Mg Fe 1s 2 2s 2 2p 6 3s 2 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 6 Ar1s 2 2s 2 2p 6 3s 2 3p 6 What is the highest filled energy level? Sublevel? Orbital?

QUESTION OF THE DAY Why do people still use a ring model, if we know that some orbitals, like p and d orbitals, have complex shapes. Day

Electron Configurations Practice: S F 1s 2 2s 2 2p 6 3s 2 3p 4 1s 2 2s 2 2p 5 P 1s 2 2s 2 2p 6 3s 2 3p 3

Practice 2 Unit 4 # 10 d. Co = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 7 What is the highest filled energy level? ___ What is the highest filled sublevel? ___ What is the highest filled orbital? ______ 2 4s 4s / 3d

Practice 2 Unit 4

QUESTION OF THE DAY Draw the electron configurations for Li, Na, and K. What do they have in common? What else do they have in common (check the periodic table)? 1s 2 2s 1 1s 2 2s 2 2p 6 3s 1 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 Day

Why do exceptions exist? How can you explain the exceptions? V = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3

How do we define the “address” of the electron within the atom?

Question of the Day 1. Complete the electron configuration and noble gas notation for gallium. electron configuration = _________________ noble gas notation = ___________ highest filled energy level = ___ highest filled sublevel = ______ # of valence electrons = ___ 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 1 [Ar]4s 2 3d 10 4p 1 3 4s / 3d 3 Day

Electron Configurations using noble gas notation for: K Fe [Ar]4s 1 [Ar]4s 2 3d 6 Cd Sn [Kr]4d 10 5s 2 [Kr]4d 10 5s 2 5p 2 Still Show valence electrons! valence electrons = electrons in the outermost energy level – determine reactivity

Orbital diagrams = notation that shows specifically how electrons are arranged in orbitals - each orbital is represented w/ a line or box Examples: Sc = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 1 1s2s2p3s3p4s3d

Examples: N = 1s 2 2s 2 2p 3 1s2s2p Hund’s Rule – electrons within a sublevel prefer separate orbitals if possible

ElementElec. Config. Noble Gas Notation Orbital Diagram Cl # of Valence Elecs.

Read / review section 5.2 and complete #s on page 137 AND #s on page 152 Assignment

Prelab

Question of the Day 1.How did the Gaviscon lab demonstrate the importance of valence electrons? 2.Is there a connection between valence electrons and an element’s placement on the periodic table? If so, what? 2-11 Day 3

Hand in Labs!!!

Test will be…