Do Now What similar feature can be seen in Mendeleev’s and Moseley’s periodic table? What are the three subatomic particles and their corresponding properties? Do you think similar properties of the elements are related to subatomic particles? If yes, which one? If no, why not?

The Hog Hilton Complete Part 1

Hog Hilton Sample Problem Book 15 hogs into their rooms 6th floor ____ ____ ____ ____ ___ 5th floor ______ ______ ______ 4th floor ______ 3rd floor ______ ______ ______ 2nd floor ______ 1st floor ______

The Quantum Mechanical Model & Electron Configuration

The Quantum Mechanical Model Tell us about the location and energy of electrons Electrons do not have a direct orbit around the nucleus Locations of electrons are based on probability Electron clouds

Rules of Electron Configuration

Aufbau Principle Electrons enter orbitals of lowest energy first Orbitals within a sublevel have equal energy Which hog rule is this?

Pauli Exclusion Principle An atomic orbital may only hold two electrons Electrons must have opposite spin Clockwise or counterclockwise Denoted with arrows Which hog rule is this?

Hund’s Rule Every orbital of the same energy is singly occupied before any orbital is doubly occupied Electrons have the same spin Second electrons are added so the two electrons have opposite spins Which hog rule is this?

The Hog Hilton Complete Part 2

Electron Orbital Diagram 4s ___ 3p ___ ___ ___ 3s ___ 2p ___ ___ ___ 2s ___ 1s ___

Analyze the Hilton What do the numbers in the Hog Hilton represent? The floor number What do the numbers in the electron orbital diagram represent? The energy level the electron is in

Analyze the Hilton Are the layouts of the Hog Hilton and the electron orbital diagram the same? Number of rooms = Number of energy sublevels

How many electrons? How many electrons fit in the s energy level? In the p energy level? In the d energy level?

Filling Electron Orbitals 3d ___ ___ ___ ___ ___ 4s ___ 3p ___ ___ ___ 3s ___ 2p ___ ___ ___ 2s ___ 1s ___

Do Now Complete an atomic orbital diagram for calcium. Complete an atomic orbital diagram for zinc. Complete an atomic orbital diagram for krypton.

Write the electron configuration for the following: Li Be B C N O

My Hand Hurts! Write the electron configuration for Barium. Freeze! Noble gas/short hand configuration: Find the nearest noble gas that came before the element you are interested in Write the symbol of that noble gas in [brackets] Write the configuration as normal from there on

Lewis Dot Structures

Valence Electrons Electrons in the last energy level of an atom Increase in number across a period Equal to the group number of the element Max # of valence electrons = 8

Valence Electrons Why are these the important electrons? Are in the highest energy level Most exposed Most involved in chemical reactions

Lewis Dot Diagrams Show # of valence electrons an element has Element’s symbol surrounded by dots Dots = valence electrons Drawn as if there is a square around the symbol Two dots per side

Examples Li Be B C N O F Ne

Do Now Draw the Lewis dot diagram for francium, phosphorus, and helium. What do the dots mean? What is the max number of valence electron an atom can have?

Properties Elements in same group have similar properties Same number of valence electrons Same number of electrons used in reactions Examples Noble gases - 8 valence electrons Favorable - do not react Halogens - 7 valence electrons One electron short of max of 8 electrons Readily react with elements who have a single electron